# Colorado DSM Market Potential Assessment Final Report

Prepared for Xcel Energy Denver, Colorado
Prepared by KEMA, Inc. Oakland, California

March 12, 2010Experience you can trust



### . 

### Copyright © 2010, KEMA, Inc. The information contained in this document is the excl usive, confidential and proprietary property of KEMA, Inc. and is protected under the trade secret and copyright laws of the U.S. and other international laws, treaties and conventions. No part of this work may be disclosed to any third party or used, reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or by any information storage or retrieval system, without firs t receiving the express written permission of KEMA, Inc. Except as otherwise noted, all trademarks appear ing herein are proprietary to KEMA, Inc.

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment i 

### 1. Executive Summary ........................................................................................................... ............... 1–1 1.1 Scope and Approach......................................................................................................... ...... 1–1 1.2 Results .................................................................................................................... ................ 1–2 1.2.1 Aggregate Base Energy-Efficiency Results............................................................... 1–4 1.2.2 Base Energy-Efficiency Results by Sector ................................................................ 1–9 1.2.3 Demand Response Results....................................................................................... 1–12 1.2.4 Behavioral-conservation Results ............................................................................. 1–13 1.2.5 Emerging Technology Results................................................................................. 1–15 1.2.6 Sensitivity to Higher Avoided-Cost Forecasts......................................................... 1–16 1.2.7 Comparison to Other Analyses................................................................................ 1–19 1.2.8 Uncertainty of Results ............................................................................................. 1–20 1.3 Conclusions ................................................................................................................ .......... 1–20 2. Introduction................................................................................................................ ....................... 2–1 2.1 Overview ................................................................................................................... ............. 2–1 2.2 Study Appro ach ............................................................................................................. ......... 2–2 2.3 Layout of the Report....................................................................................................... ........ 2–2 3. Methods and Scenarios ....................................................................................................... .............. 3–1 3.1 Characterizing the Ener gy-Efficiency Resource..................................................................... 3–1 3.1.1 Defining Energy-Efficiency Potential ....................................................................... 3–1 3.2 Summary of Analytical St eps Used in this Study................................................................... 3–3 3.3 Scenario Analysis .......................................................................................................... ......... 3–5 3.3.1 Fifty-percent Incentive Scenario................................................................................ 3–7 3.3.2 Seventy-five-percen t Incentive Scenario................................................................... 3–7 3.3.3 One-hundred-percent Incentive Scenario .................................................................. 3–7 3.3.4 Summary of Scenarios............................................................................................... 3–7 3.3.5 Avoided-Cost Scenarios ............................................................................................ 3–9 4. Baseline Results ............................................................................................................ .................... 4–1 4.1 Overview ................................................................................................................... ............. 4–1 4.2 Electricity................................................................................................................ ................ 4–3 4.2.1 Residential .............................................................................................................. ... 4–3 4.2.2 Comme rcial ............................................................................................................... 4–9 4.2.3 Industrial............................................................................................................... ... 4–13 4.3 Natural Gas ................................................................................................................ ........... 4–14 4.3.1 Residential .............................................................................................................. . 4–14 4.3.2 Comme rcial ............................................................................................................. 4– 19 4.3.3 Industrial............................................................................................................... ....4-22

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment ii 

### 5. Electric Energy-Effici ency Potential Results................................................................................ .....5-1 5.1 Technical and Economic Potential ..........................................................................................5 -1 5.1.1 Overall Technical and Economic Potential ................................................................5-1 5.1.2 Technical and Economic Potential Detail...................................................................5-2 5.1.3 Energy-Efficiency Supply Curves ..............................................................................5-9 5.2 Achievable (Program) Potential ............................................................................................5 -10 5.2.1 CFL Potentials and Fede ral Lighting Standards.......................................................5-14 5.2.2 Breakdown of Achievable Potential .........................................................................5-15 5.3 Behavioral Conservation and Emerging Technologies .........................................................5-30 5.3.1 Behavioral Conservation ..........................................................................................5-30 5.3.2 Emerging Technologies............................................................................................5-32 5.4 Alternate High Avoi ded-Cost Scenario .................................................................................5-38 5.4.1 Economic Potentials .................................................................................................5-38 5.4.2 Achievable Potentials ...............................................................................................5-41 6. Natural-Gas Energy-Effi ciency Poten tial Results............................................................................. .6-1 6.1 Technical and Economic Potential ..........................................................................................6 -1 6.1.1 Overall Technical and Economic Potential ................................................................6-1 6.1.2 Technical and Economic Potential Detail...................................................................6-2 6.1.3 Energy-Efficiency Supply Curves ..............................................................................6-7 6.2 Achievable (Program) Potential ............................................................................................. .6-8 6.2.1 Breakdown of Achievable Potential .........................................................................6-11 6.3 Behavioral Conservation .................................................................................................... ...6-20 6.4 Alternate High Avoided Cost Scenario .................................................................................6-23 6.4.1 Economic Potentials .................................................................................................6-23 6.4.2 Achievable Potentials ...............................................................................................6-27 7. Demand Response Potential Results........................................................................................... .......7-1

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment iii 

### List of Figures: Figure 1-1 Estimated Electric Energy-Effic iency Savings Poten tial, 2010-2020.....................................1–5 Figure 1-2 Estimated Peak-Demand Savings Potential, 2010-2020 .........................................................1–5 Figure 1-3 Estimated Natural Gas Savings Potentia l, 2010-2020.............................................................1–6 Figure 1-4 Benefits and Costs of Elect ric Efficiency Savings—2010-2020*...........................................1–7 Figure 1-5 Benefits and Costs of Natu ral-Gas Efficiency Savings—2010-2020*....................................1–8 Figure 1-6 Net Achievable Energy Savings (2020) by Sector..................................................................1–9 Figure 1-7 Residential Net Energy Sa vings Potential by End Use (2020)..............................................1–10 Figure 1-8 Commercial Savings Potential by End Use (2020)...............................................................1–11 Figure 1-9 Industrial Savings Po tential by End Use (2020) ...................................................................1–1 2 Figure 1-10 Electric Energy Economic Potentia ls with Emerging Technologies (11 Years).................1–16 Figure 1-11 Peak-Demand Economic Potentials with Emerging Technologies (11 Years) ...................1–16 Figure 1-12 Economic Electric Potentials by Avoided-Cost Scenario (2020)........................................1–17 Figure 1-13 Economic Gas Potentials by Avoided-Cost Scenario (2020)..............................................1–18 Figure 1-14 Comparison of Current DSM Potential Study to the 2006 DSM Potential Study Average Annual Savings and Program Costs............................................................................................... .1–19 Figure 3-1 Conceptual Framework for Estimates of Fossil Fuel Resources.............................................3–2 Figure 3-2 Conceptual Relationship among Energy-Efficiency Potential Definitions .............................3–3 Figure 3-3 Conceptual Overview of Study Process ................................................................................ ..3–4 Figure 3-4 Electric Avoided-Cost Forecast - Base ............................................................................... ..3–11 Figure 3-5 Electric Avoided-Co st Forecast – High Cost ........................................................................3– 11 Figure 3-6 Electric Avoided-Cost Forecast – Base-High Comparison...................................................3–12 Figure 3-7 Natural Gas Avoided-Cost Forecast – Base-High Comparison ............................................3–12 Figure 4-1 Electricity Usage Breakdown – Xcel Energy Colorado Service Territory..............................4–2 Figure 4-2 Natural Gas Usage Breakdown—Xcel Energy Colorado Service Territory ...........................4–3 Figure 4-3 Residential Electric ity Shares by Segment, 2010....................................................................4 –7 Figure 4-4 Residential Electric ity Shares by En d Use, 2010....................................................................4 –7 Figure 4-5 Residential Electricity Usage by Customer Segment..............................................................4–8 Figure 4-6 Residential Electr icity Usage by End Use............................................................................ ...4–8 Figure 4-7 Commercial Electricity Usage by Building Type .................................................................4–12 Figure 4-8 Commercial Electri city Usage by End Use...........................................................................4– 12 Figure 4-9 Industrial Electricity Usage by Industry Type ......................................................................4 –13 Figure 4-10 Industrial Electri city Usage by End Use ............................................................................ .4–14 Figure 4-11 Residential Natural- Gas Shares by Segment, 2010.............................................................4–17 Figure 4-12 Residential Natural- Gas Shares by End Use, 2010 .............................................................4–17

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment iv 

### Figure 4-13 Residential Natural-G as Usage by Customer Segment.......................................................4–18 Figure 4-14 Residential Natu ral-Gas Use by End Use............................................................................4 –18 Figure 4-15 Commercial Natural-G as Usage by Building Type .............................................................4-21 Figure 4-16 Commercial Natural- Gas Usage by End Use.......................................................................4-21 Figure 4-17 Industrial Natural-G as Usage by Industry Type...................................................................4-2 2 Figure 4-18 Industrial Natura l Gas Usage by End Use............................................................................ 4-23 Figure 5-1 Estimated Electric Technical and Econom ic Potential, 2020 Xcel Energy Colorado Service Territory .............................................................................................................. ..................5-2 Figure 5-2 Technical and Economic Potential (2020) Energy Savings by Sector—GWh per Year..........5-3 Figure 5-3 Technical and Economic Potential (2020) Demand Savings by Sector—MW........................5-3 Figure 5-4 Technical and Economic Potential ( 2020) Percentage of Base Energy Use ............................5-4 Figure 5-5 Technical and Economic Potential ( 2020) Percentage of Base Peak Demand.........................5-4 Figure 5-6 Residential Energy-Savings Potential by Building Type (2020) .............................................5-4 Figure 5-7 Residential Demand-Savings Po tential by Building Type (2020) ...........................................5-4 Figure 5-8 Commercial Economic Energy-Savings Potential by Building Type (2014) ..........................5-5 Figure 5-9 Commercial Economic Demand-Savings Potential by Building Type (2014).........................5-5 Figure 5-10 Industrial Econom ic Energy-Savings Potential by Business Type (2020).............................5-6 Figure 5-11 Industrial Econom ic Demand-Savings Potential by Business Type (2020)...........................5-6 Figure 5-12 Residential Economic Energy-Sav ings Potential by End Use (2020)....................................5-7 Figure 5-13 Residential Economic Demand-Sa vings Potential by End Use (2020)..................................5-7 Figure 5-14 Commercial Economic Energy Sa vings Potential by End Use (2014) ..................................5-8 Figure 5-15 Commercial Economic Demand Savi ngs Potential by End Use (2014) ................................5-8 Figure 5-16 Industrial Economic Energy-Sa vings Potential by End Use (2020) ......................................5-8 Figure 5-17 Industrial Econom ic Demand-Savings Potentia l by End Use (2020) ....................................5-8 Figure 5-18 Electric Energy Supply Curve*...................................................................................... ........5-9 Figure 5-19 Peak-Demand Supply Curve* .......................................................................................... ....5-10 Figure 5-20 Achievable Electric Energy-Savings: All Sectors................................................................5-11 Figure 5-21 Achievable Peak-Dem and Savings: All Sectors ..................................................................5-12 Figure 5-22 Benefits and Costs of En ergy-Efficiency Savings—2010-2020* ........................................5-13 Figure 5-23 Incremental Impacts of Program CFLs versus Other Measures – 75% Incentive Case.......5-15 Figure 5-24 Net Achievable Energy Savings (2020) by Sector—GWh per Year ...................................5-16 Figure 5-25 Net Achievable Peak-Dema nd Savings (2020) by Sector—MW.........................................5-16 Figure 5-26 Achievable Energy Savings: Residential Sector ..................................................................5-17 Figure 5-27 Achievable Peak-Dema nd Savings: Residential Sector .......................................................5-17 Figure 5-28 Residential Net Energy-Sav ings Potential by End Use (2020) ............................................5-18 Figure 5-29 Residential Net Peak-Savi ngs Potential by End Use (2020)................................................5-18

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment v 

### Figure 5-30 Achievable Energy Savings: Commercial Sector ................................................................5-21 Figure 5-31 Achievable Peak-Dema nd Savings: Commercial Sector .....................................................5-22 Figure 5-32 Commercial Net Energy-Savi ngs Potential by End Use (2020) ..........................................5-23 Figure 5-33 Commercial Net Peak-Savi ngs Potential by End-Use (2020)..............................................5-23 Figure 5-34 Achievable Energy Savings: Industrial Sector.....................................................................5- 26 Figure 5-35 Achievable Peak-Dema nd Savings: Industrial Sector..........................................................5-26 Figure 5-36 Industrial Net Energy-Savin gs Potential by End-Use (2020)...............................................5-27 Figure 5-37 Industrial Net Peak-Savings Potential by End-Use (2020) ..................................................5-27 Figure 5-38 Electric Technical and Economic Poten tials with Behavioral-Conservation Activities ......5-31 Figure 5-39 Electric Energy Economic Potentia ls with Emerging Technologies (11 Years)..................5-33 Figure 5-40 Peak-Demand Economic Potentials with Emerging Technologies (11 Years) ....................5-34 Figure 5-41 Residential Electric Economic Potentia ls with Emerging Technologies (11 Years) ...........5-35 Figure 5-42 Residential Peak-Demand Economic Potentials with Emerging Technologies (11 Years) ........................................................................................................ ..........5-35 Figure 5-43 Commercial Electric Economic Potentia ls with Emerging Technologies (11 Years)..........5-36 Figure 5-44 Commercial Peak-Demand Ec onomic Potentials with Emerging Technologies (11 Years) ........................................................................................................ ..........5-36 Figure 5-45 Achievable Potentials fo r Residential Emerging Technologies ...........................................5-37 Figure 5-46 Achievable Potentials fo r Commercial Emerging Technologies .........................................5-37 Figure 5-47 Economic Electric Potentials by Avoided-Cost Scenario (2020).........................................5-38 Figure 5-48 Economic Potential Comparison (2020) Energy Savings by Sector—GWh per Year.........5-39 Figure 5-49 Economic Potential Comparison (2020) Demand Savings by Sector—MW.......................5-39 Figure 5-50 Residential Economic Potential (2020) Energy Savings by End Use—GWh per Year.......5-40 Figure 5-51 Residential Economic Potential (2020) Demand Savings by End Use—MW.....................5-40 Figure 5-52 Commercial Economic Potential (2020) Energy Savings by End Use—GWh per Year.....5-41 Figure 5-53 Commercial Economic Potential (2020) Demand Savings by End Use—MW ...................5-41 Figure 6-1 Estimated Natural-Gas Technical and Economic Potential, 2020 Xcel Energy Colorado Service Territory .............................................................................................................. ..................6-2 Figure 6-2 Technical and Economic Potential (202 0) Energy Savings by Sector Millions of Dth per Year................................................................................................................... ....................6-3 Figure 6-3 Technical and Economic Potential ( 2020) Percentage of Base Energy Use ............................6-3 Figure 6-4 Residential Energy-Savings Potential by Building Type (2020) .............................................6-4 Figure 6-5 Commercial Energy-Savings Po tential by Building Type (2020)............................................6-4 Figure 6-6 Industrial Energy-Savings Potential by Business Type (2020)................................................6-5 Figure 6-7 Residential Economic Energy-Savings Potential by End Use (2020)......................................6-6 Figure 6-8 Commercial Economic Energy-Savings Potential by End Use (2020) ....................................6-6

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment vi 

### Figure 6-9 Industrial Economic Energy-Sav ings Potential by End Use (2020) ........................................6-7 Figure 6-10 Natural-Gas Supply Curve* .......................................................................................... .........6-8 Figure 6-11 Achievable Ener gy Savings: A ll Sectors............................................................................. ...6-9 Figure 6-12 Benefits and Costs of En ergy-Efficiency Savings—2010-2020* ........................................6-10 Figure 6-13 Net Achievable Energy Savings (2020) by Sector—Million Dth per Year .........................6-12 Figure 6-14 Achievable Energy Savings: Residential Sector ..................................................................6-13 Figure 6-15 Residential Net Energy-Sav ings Potential by End Use (2020) ............................................6-13 Figure 6-16 Achievable Energy Savings: Commercial Sector ................................................................6-16 Figure 6-17 Commercial Net Energy-Savi ngs Potential by End Use (2020) ..........................................6-17 Figure 6-18 Achievable Energy Savings: Industrial Sector.....................................................................6- 19 Figure 6-19 Industrial Net Energy-Savin gs Potential by End-Use (2020)...............................................6-19 Figure 6-20 Natural-Gas Technical and Economic Pote ntials with Behavioral -Conservation Activities6-22 Figure 6-21 Economic Gas Potentials by Avoided-Cost Scenario (2020)...............................................6-24 Figure 6-22 Economic Potential Comparison (2020) Energy Savings by Sector—Million Dth per Year................................................................................................................... ..................6-25 Figure 6-23 Residential Economic Potential ( 2020) Energy Savings by End Use—Millions of Dth per Year ................................................................................................................ ................6-26 Figure 6-24 Commercial Economic Potential ( 2020) Energy Savings by End Use—Millions of Dth per Year ................................................................................................................ ................6-26

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment vii 

### List of Tables: Table 1-1 Summary of Cumulative DSM Potentials from All Sources—2010-2020...............................1–3 Table 1-2 Average Annual Achievable Potentials and Program Costs from All Sources—2010-2020...1–4 Table 1-3 Summary of Achievable El ectric Potential Results—2010-2020.............................................1–8 Table 1-4 Summary of Achievable Natu ral Gas Potential Results—2010-2020......................................1–9 Table 1-5 Summary of Demand Respon se Potentials for (2010-2020) ..................................................1–13 Table 1-6 Achievable Potentials for Electric Behavioral Con servation (2010-2020).............................1–14 Table 1-7 Achievable Potentials for Natural-Gas Behavioral Con servation (2010-2020) .....................1–14 Table 1-8 Comparison of Achievable Energy Pote ntials for Base and High Avoided Cost Scenarios Cumulative to 2020............................................................................................................. ............1–18 Table 1-9 Comparison of Current DSM Potential Study to the Current Xcel Energy DSM Plan Average Annual Savings and Program Costs .................................................................................1–20 Table 3-1 Scenario Average Spending during 2010-2020 Forecast Period ($1000s) Electric Programs.............................................................................................................. ................3–8 Table 3-2 Scenario Average Spending during 2010-2020 Forecast Period ($1000s) Natural-Gas Programs........................................................................................................... ............3–9 Table 3-3 Electric Time-of-Use Period Definitions.............................................................................. ..3–10 Table 4-1 Residential Baseline Consumpti on Summary, Electricity – kWh, 2010 ..................................4–5 Table 4-2 Residential Baseline Peak Demand Summary, Electricity – kW, 2010 ...................................4–6 Table 4-3 Commercial Baseline Elect ricity Consumption Factors.........................................................4–10 Table 4-4 Commercial Baseline Electricity Consumption Summary – MWh and MW.........................4–11 Table 4-5 Residential Baseline Consump tion Summary – Natural Gas - Therms..................................4–16 Table 4-6 Commercial Baseline Natu ral-Gas Consumption Summary ..................................................4–20 Table 5-1 Summary of Achievable Potential Results—2010-2020.........................................................5-14 Table 5-2 Low-Income Potentials Compared to Total Residential Potentials (2020) .............................5-19 Table 5-3 Measure-Specific Residential R esults (Cumulative to 2020) – GWh .....................................5-20 Table 5-4 Measure-Specific Commercial Resu lts (Cumulative to 2020) – GWh....................................5-24 Table 5-5 Measure-Specific Industrial Resu lts (Cumulative to 2020) – GWh........................................5-28 Table 5-6 Achievable Potentials for Electric Behavioral Conservation ..................................................5-32 Table 5-7 Comparison of Achievable Energy Pote ntials for Base and High Avoided Cost Scenarios Cumulative to 2020 - GWh....................................................................................................... .......5-42 Table 5-8 Comparison of Achievable Energy Pote ntials for Base and High Avoided Cost Scenarios Cumulative to 2020 - MW ........................................................................................................ .......5-43 Table 6-1 Summary of Achievable Potential Results—2010-2020.........................................................6-11 Table 6-2 Low-Income Potentials Compared to Total Residential Potentials (2020) .............................6-14

# Table of Contents

Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment viii 

### Table 6-3 Measure-Specific Residential Results (Cumulative to 2020) – Dth........................................6-15 Table 6-4 Measure-Specific Commercial Results (Cumul ative to 2020) – Dth Existing Construction ..6-17 Table 6-5 Measure-Specific Commercial Results (Cum ulative to 2020) – Dth New Construction ........6-18 Table 6-6 Measure-Specific Industrial Resu lts (Cumulative to 2020) – Dth...........................................6-20 Table 6-7 Achievable Potentials for Na tural-Gas Behavioral Conservation ...........................................6-23 Table 6-8 Comparison of Achievable Energy Pote ntials for Base and High Avoided Cost Scenarios Cumulative to 2020 – Millions of Dth........................................................................................... ..6-27 Table 7-1 Comparison of National Assessment of Demand Response Potentials for Colorado with Estimates for Xcel Energy (Cumulative to 2020)..............................................................................7-3 Table 7-2 Summary of Demand Response Potentials for (2010-2020) .....................................................7-4

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–1 

# 1. Executive Summary This study assessed the electric and natural gas DSM (demand side management) potential for the residential, commercial, and industrial sectors in th e Xcel Energy Colorado service territory. The study was commissioned by Xcel Energy and was proposed in Xcel Energy’s most recent Biennial Plan as an effort that would help inform the next Biennial Plan, to be filed in 2010. The goal of this study was to determine the levels of DSM savings available in the Xcel Energy Colorado service territory, the costs associated with procuring these savings, and whethe r the measures delivering the savings are cost effective in Colorado. This study provides energy-efficiency and demand-response potential estimates for an 11-year period, from 2010-2020. 

# 1.1 Scope and Approach In this study, three types of energy-e fficiency potential were estimated:

• Technical potential, defined as the complete penetration of all measures analyzed in applications where they were deemed technically feasible from an engineering perspective

• Economic potential, defined as the technical potential of those energy-efficiency measures that are cost-effective when compared to supply-side alternatives

• Achievable program potential, the amount of savings that would occur in response to specific program funding and measure incentive levels. In addition, naturally occurring energy-efficiency impacts were estimated. These are savings that result from normal market forces. Achievable program potential reflects savings that are projected beyond those that would occur naturally in th e absence of any market intervention. The method used for estimating potential is a “bottom- up” approach in which energy-efficiency costs and savings are assessed at the customer-segment and energy-efficiency measure level. For cost-effective measures (based on the total resource cost, or TRC, test), program savings potential was estimated as a function of measure economics, reba te levels, and program marketi ng and education efforts. The modeling approach was implemen ted using KEMA’s DSM ASSYST TM 

### model. This model allows for efficient integration of large quantities of measure, building, and economic data to determine energyefficiency potential. For this study, three different program funding scenar ios were constructed. The first scenario assumed 50 percent of incremental measure costs are paid out in customer incentives. The second scenario allowed for incentives covering 75 percent of incremental measure costs. The final scenario allowed for incentives covering 100 percent of incremental measu re costs. Program energy and peak-demand savings, as well as program cost effectiveness, we re assessed under these three funding scenarios.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–2 

### The base assessment addressed measures and processes that are commercially available with proven savings and customer acceptance. In addition, we examined some emerging technologies and behavioralconservation approaches. These additional components show promise for future DSM program impacts, but projections of their savings potentials have much more uncertainty than those of more standard measures. Hence, the emerging technologies (primar ily LED lighting and indirect evaporative cooling) and behavioral-conservation approaches were addressed separately, so that results would be isolated from the other parts of the analysis. The study did not ad dress incremental improvements in energy efficiency due to the ongoing evolution and improvement of technologies. These improvements will lead to increased energy-efficiency potential, over time. Al so, the study did not address the ongoing tightening of equipment and building standards, which will in turn lead to a decrease in en ergy-efficiency potential, over time. To estimate demand response (DR) impacts, we reviewed impacts from the Federal Energy Regulatory Commission’s 2009 National Assessment of Demand Response Potential 1 

### for the State of Colorado and customized the results to the Xcel Energy Colo rado service territory, utilizing information on Xcel Energy’s peak demand, relative to Colorado peak de mand, and information on current programs being run by Xcel Energy. 

# 1.2 Results
In Table 1-1 , we report overall results of the DSM potential study, showing potentials for base energyefficiency programs, demand-response programs, behavioral-conservation efforts, and emerging technologies. Cumulative results from 2010 to 2020 are shown. Emerging technologies are shown at the bottom of the table because the results of the emergi ng technology analysis cover an 11-year period that does not necessarily line up with the 2010-2020 period because we are not sure when these technologies will be sufficiently developed for inclusion in full-scale energy efficiency programs. Base energy-efficiency and demand-response measures account for the majority of the net economic 2 

### and achievable potentials. These are measures where we have the most confidence in the savings estimates. Residential behavioral-conservation activities, if current assumptions hold, could increase achievable electric potentials by 2 percent to 4 percent and coul d increase natural gas potentials by 8 percent to 14 percent, depending on the scenario. (Residential behavi oral conservation has a bigger proportionate affect for gas because the residential share of energy u sage is much higher for gas). Emerging technologies

1 

### A National Assessment of Demand Response Potential , Staff Report, Federal Energy Regulatory Commission, prepared by The Brattle Group, Freeman, Sullivan & Co ., and Global Energy Partners, LLC, June 2009. 2 

### Net economic potential is defined as economic potential minus naturally occurring savings.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–3 

### could increase achievable electric DSM savings by 7 pe rcent to 20 percent, depending on the scenario, if the emerging measures prove to be commercially successful, although, substantive impacts from emerging technologies might not materialize for several more years. Table 1-1 Summary of Cumulative DSM Potentials from All Sources—2010-2020 Scenario
Fuel Source of Potential Technical Economic Net Economic 100% Incentives 75% Incentives 50% Incentives Electricity Base Energy Efficiency 8,938 7,563 6,420 4,892 2,806 1,802 GWh Conservation 218 216 216 176 107 44 Total 9,112 7,779 6,636 5,068 2,913 1,846 Electricity Base Energy Efficiency 2,161 1,730 1,572 1,198 538 328 MW Base Demand Response 689 689 689 478 478 300 Conservation 46 44 42 43 26 11 Total 2,892 2,463 2,303 1,720 1,043 639 Natural Base Energy Efficiency 55.4 39.1 37.5 24.4 9.0 4.5 Gas Conservation 2.2 2.1 2.1 1.9 1.3 0.5 Million Dth Total 57.6 41.2 39.6 26.3 10.3 4.9 Emerging GWh 2,207 1,800 1,781 991 335 119 Technologies MW 635 628 627 262 95 48

Notes: Net economic potential is defined as economic potentia l minus naturally occurring savi ngs. Behavioral-conservation measures were modeled under high, medium, and low program -effort scenarios that correspond to the 100%, 75%, and 50% incentives scenarios. Demand response utilizes two scenarios: business–as-usual (BAU) and expanded ; the BAU lines up with the 50% incentives scenario and the expanded lines up with the 100% and 75% incentives scenarios. Emerging technologies are analyzed over an 11-year period that doesn’t nece ssarily line up with the 2010-2020 period, and therefore their results are reported separately from other electric resu lts. Substantive impacts from emerging technologies might not materialize for another five years or more. 

### Table 1-2 shows average annual savings accomplishment re quired to reach the achievable potentials presented in Table 1-1 along with average annual program costs. As shown in Table 1-2 , expected average annual program costs for basic electric and gas energy efficiency programs range from $361 million for the 100-percent incentives scenario to $ 119 million for the 75-per cent incentives scenario to $57 million for the 50-percent incentive scenario. Demand response program costs range from $49 million per year for the expanded scenario down to $31 million per year for the business-as-usual scenario. Annual behavioral conservation program cost s for electricity and natural gas are $11 million, $6 million, and $1 million for the high, medium, and low program scenarios. Emerging technology costs could range from $69 million per year for the 100-per cent incentives scenario down to $5 million per year for the 50-percent incentives scenario. Overall, if em erging technologies are taken into account, potential electric savings range between 551 GWh per year ( 100-percent incentives) to 179 GWh per year (50- percent incentives) and between 180 MW per year (100-percent incentives) to 62 MW per year (50- percent incentives). Potential gas savings range between 2.4 million Dth per year (100-percent

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–4 

### incentives) to 0.4 million Dth per year (50-percent in centives). Overall program costs (including costs for emerging technologies) range from $489 million per y ear (100-percent incentives) down to $94 million per year (50-percent incentives). Table 1-2

Average Annual Achievable Potentials and Program Costs from All Sources—2010-2020 Savings by Scenario Costs ($ Millions) by Scenario
Fuel Source of Potential 100% Incentives 75% Incentives 50% Incentives 100% Incentives 75% Incentives 50% Incentives Electricity Base Energy Efficiency 444.8 255.1 163.8 $247.7 $87.0 $43.1 GWh Conservation 16.0 9.8 4.0 $6.2 $3.0 $0.8 Total 460.8 264.8 167.8 $253.9 $90.0 $43.9 Electricity Base Energy Efficiency 109.0 49.0 29.8 Shown above under GWh MW Demand Response 43.5 43.5 27.3 $48.6 $48.6 $31.2 Conservation 3.9 2.4 1.0 Shown above under GWh Total 156.3 94.8 58.1 Equals GWh total plus DR costs Natural Base Energy Efficiency 2.2 0.8 0.4 $113.3 $32.4 $13.5 Gas Conservation 0.2 0.1 0.0 $4.6 $2.6 $0.7 Million Dth Total 2.4 0.9 0.4 $118.0 $35.0 $14.2 Emerging GWh 90.1 30.5 10.8 $68.6 $14.1 $4.6 Technologies MW 23.8 8.6 4.3 Shown above under GWh

Also, see notes for Table 1-1. 

### We discuss the various aspects of DSM potentials ne xt, with a focus on the base energy-efficiency potentials because they provide the largest, most reliable source of future savings. 

## 1.2.1 Aggregate Base Energy-Efficiency Results Estimates of electric energy-savings potential are presented in Figure 1-1 . Technical potential is estimated at 8,938 GWh per year; much of this potential is estimated to be economically viable. Economic potential is estimated at 7,563 GWh. Net 3 

### achievable program potentials range from 4,892 GWh per year in the 100-percent incentive scenario to 2,806 GWh per year for the 75-percent incentive scenario to 1,802 GWh per year for the 50-percent incen tive scenario. Economic potential is estimated to be 23 percent of base 2020 energy use; achievable potentials range from 76 percent of net economic potential (after factoring out naturally occurring savin gs) in the 100-percent incentive case to 44 percent

3 

### Net refers to savings beyond those estimated to be naturally occurring; that is, from customer adoptions that would occur in the absence of an y programs or standards.

### Xcel Energy Colorado March 12, 2010 

### of net economic potential in the 75-percent incentive case to 28 percent of net economic potential in the 50-percent incentive case. Peak-demand savings potential estimates are provided in Figure 1-2 . Technical potential is estimated at 2,161 MW, and economic potential is estimated at 1,730 MW. Net achievable program potential ranges from a high of 1,198 MW in the 100-percent in centive case down to 328 MW in the 50-percent incentive case. Figure 1-1 Estimated Electric Energy-Efficiency Savings Potential, 2010-2020

32,808

8,938 7,563 6,420 4,892 2,806 1,802 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000

Base Use Technical Economic Econ minus Nat Occ 100% Incentives 75% Incentives 50% IncentivesCumulative Annual GWh



### Figure 1-2 Estimated Peak-Demand Savings Potential, 2010-2020

6,639

2,161 1,730 1,572 1,198 538 328 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000

Base Use Technical Economic Econ minus Nat Occ 100% Incentives 75% Incentives 50% IncentivesCumulative Peak MW



### DSM Market Potential Assessment 1–5

### Xcel Energy Colorado March 12, 2010 

### Natural gas savings potential estimates are provided in Figure 1-3 . Technical potential is estimated at 55 million Dth, and economic potential is estimated at 39 million Dth. Net achievable program potential ranges from a high of 24 million Dth in the 100-percent incentive case to 9 million Dth in the 75-percent incentive case down to 4 million Dth in the 50-percen t incentive case. Economic potential is estimated to be 28 percent of base 2020 gas use; achievable potentials range from 67 percent of net economic potential in the 100-percent incentive case to 23 percent of net economic potential in the 75-percent incentive case to 11 percent of net economic potentia l in the 50-percent incentive case. Much of the natural gas savings is tied to long-lived equipment that will not be re placed during the 2010-2020 period, so achievable gas potentials (as a percent of net economic potential) are somewhat lower than electric potentials. Figure 1-3 Estimated Natural Gas Savings Potential, 2010-2020

137.4

55.4 39.1 37.5 24.4 9.0 4.5 0 20 40 60 80 100 120 140 160

Base Use Technical Economic Econ minus Nat Occ 100% Incentives 75% Incentives 50% IncentivesCumulative Annual Dth (Millions)



### Figure 1-4 depicts costs and benefits under each program funding scenario from 2010 to 2020 for electric energy efficiency. The present value of program costs (including administration, marketing, and incentives) is $354 million under the 50-percent in centive scenario, $719 million under the 75-percent incentive scenario, and $2,130 million under the 10 0-percent incentive scenario. The present value of total avoided-cost benefits is $2,095 million under 50-percent incentiv es, $3,337 million under 75-percent incentives, and $6,496 million under 100-pe rcent incentives. The present value of net avoided-cost benefits, i.e., the difference between total avoided-cost benefits and tota l costs (which include participant costs in addition to program costs), is $1,575 million under 50-percent incentives, $2,448 million under 75-percent incentives, and $4,166 m illion under 100-percent incentives.

DSM Market Potential Assessment 1–6

### Xcel Energy Colorado March 12, 2010 

### Figure 1-4 Benefits and Costs of Electric Efficiency Savings—2010-2020*

$573 $278 $184 $1,557
$441 $170 $201

$169 $166 $6,496

$3,337

$2,095

$0 $1,000 $2,000 $3,000 $4,000 $5,000 $6,000 $7,000Present Value in $ Millions Total Avoided Cost Benefits Participant Costs Program Incentives Program Admin and Marketing

50% Incentive 100% Incentive Net Benefits: $1,575 Million Net Benefits: $4,166 Million

75% Incentive Net Benefits: $2,448 Million

* Present value of benefits and costs over normalized 20-year measure lives; nominal disc ount rate is 7.9 percent, inflation rate is 1.5 percent. 

### Figure 1-5 shows the same sets of results for natural gas. The present value of program costs (including administration, marketing, and incentives) is $111 million under the 50-percent incentive scenario, $268 million under the 75-percent incentive scenario, a nd $956 million under the 100-percent incentive scenario. The present value of total avoided-cost benefits is $339 million under 50-percent incentives, $689 million under 75-percent incentives, and $1,902 million under 100-percent incentives. The present value of net avoided-cost benefits, i.e., the difference betw een total avoided-cost benefits and total costs (which include participant costs in addition to program costs), is $180 million under 50-percent incentives, $367 million under 75-percent incentives, and $888 million under 100-percent incentives. For both electricity and natural gas, all three of the program funding scenarios are cost-effective based on the TRC (total resource cost) test, which was the test used in this study to determine program costeffectiveness. The electric TRC benefit-cost ratios are 4.0 for the 50-percent incentive scenario, 3.8 for the 75-percent incentive scenario, and 2.8 for the 1 00-percent incentive scenario . The natural gas TRC ratios are 2.1 for the 50-percent in centive scenario and the 75-percent incentive scenario, and 1.9 for the 100-percent incentive scenario. Key results of our efficiency scenario forecasts from 2010 to 2020 are summarized in Table 1-3 (electricity) and Table 1-4 (natural gas).

DSM Market Potential Assessment 1–7

### Xcel Energy Colorado March 12, 2010 

### Figure 1-5 Benefits and Costs of Natural-Gas Efficiency Savings—2010-2020*

$149 $64 $35 $807

$204 $76 $57

$54 $48 $1,902

$689

$339

$0 $500 $1,000 $1,500 $2,000 $2,500Present Value in $ Millions Total Avoided Cost Benefits Participant Costs Program Incentives Program Admin and Marketing

50% Incentive 100% Incentive Net Benefits: $180 Million Net Benefits: $888 Million

75% Incentive Net Benefits: $367 Million

* Present value of benefits and costs over normalized 20-year measure lives; nominal disc ount rate is 7.7 percent, inflation rate is 1.5 percent. 

### Table 1-3 Summary of Achievable Electric Potential Results—2010-2020 Program Scenario Result 50% Incentive 75% Incentive 100% Incentive Gross Energy Savings - GWh 2,946 3,949 6,036 Gross Peak Demand Savings - MW 486 696 1,356 Net Energy Savings - GWh 1,802 2,806 4,892 Net Peak Demand Savings - MW 328 538 1,198 Program Costs - Real, $ Million Administration $179 $303 $682 Marketing $69 $70 $77 Incentives $227 $584 $1,966 Total $474 $957 $2,725 PV Avoided Costs Benefits $2,095 $3,337 $6,496 PV Annual Marketing and Admin Costs $184 $278 $573 PV Net Measure Costs $336 $611 $1,757 TRC Ratio 4.0 3.8 2.8

PV (present value) of benefits and costs is calcul ated over a 20-year normalized measure life for 2010- 2020 program years, nominal discount rate = 7.9 pe rcent, inflation rate = 1.5 percent; GWh and MW savings are cumulative through 2020.



### DSM Market Potential Assessment 1–8

### Xcel Energy Colorado March 12, 2010 

### Table 1-4 Summary of Achievable Natural Gas Potential Results—2010-2020 Program Scenario Result 50% Incentive 75% Incentive 100% Incentive Gross Energy Savings - Millions of Dth 6.1 10.6 26.0 Net Energy Savings - Millions of Dth 4.5 9.0 24.4 Program Costs - Real, $ Million Administration $33 $71 $181 Marketing $14 $15 $18 Incentives $101 $271 $1,047 Total $148 $357 $1,247 PV Net Avoided Costs Benefits $339 $689 $1,902 PV Annual Marketing and Admin Costs $35 $64 $149 PV Measure Costs $124 $258 $865 TRC Ratio 2.1 2.1 1.9

PV (present value) of benefits and costs is calcul ated over a 20-year normalized measure life for 2010- 2020 program years, nominal discount rate = 7.7 pe rcent, inflation rate = 1.5 percent; GWh and MW savings are cumulative through 2020. 

## 1.2.2 Base Energy-Efficiency Results by Sector Cumulative net-achievable-potential estimates by customer class are presented in Figure 1-6 for the 2010- 2020 period. The figure shows results for each funding scenario. Achievable electric energy savings are highest for the commercial sector, while achievable natural gas savings are highest for the residential sector. Note that nonresidential transport-only customers are not included in the gas analysis, and hence the gas study focuses more on residen tial and small nonresidential potentials. Figure 1-6 Net Achievable Energy Savings (2020) by Sector Electricity- GWh Natural Gas – Million Dth

2,045 2,473

374 866 1,654

285 565 1,054

184 0 500 1,000 1,500 2,000 2,500 3,000

Residential Commercial IndustrialCumulative Annual Savings by 2020 - GWh 100% Incentive 75% Incentive 50% Incentive 20.5

3.7

0.1 7.0

2.0 0.1 3.3 1.1 0.1 0 5 10 15 20 25

Residential Commercial IndustrialCumulative Annual Savings by 2020 - Dth (Millions) 100% Incentive 75% Incentive 50% Incentive



### DSM Market Potential Assessment 1–9

### Xcel Energy Colorado March 12, 2010 

### 1.2.2.1 Residential Sector Figure 1-7 shows the residential end-use distribution of electricity and natural-gas savings potential through 2020. Key electric end uses include lighti ng, cooling, refrigeration, and whole-building new construction measures. Key gas end uses include heating, water heating, and whole-building new construction measures. Figure 1-7 Residential Net Energy Savings Potential by End Use (2020) Electricity Natural Gas

505

155

54

496

202

32

27

106

20

56

395 107

41

25

314

71

19

16

88

17

28

140

47

15

12

187

34

9

16

86

17

15

128 0 100 200 300 400 500 600 Cooling

Furnace/AC Fan
Heating
Lighting
Refrigeration
Water Heating
Plug Loads

Entertainment

Computers

Miscellaneous Whole Bldg (New Constr)

Cumulative Annual GWh 100% Incentives 75% Incentives 50% Incentives 11.4

4.0

0.3

4.8 4.0

1.2

0.1

1.7 1.8

0.4

0.1

1.0

0 2 4 6 8 10 1 Heating

Water Heating

Cooking

Whole Bldg (New Constr)

Cumulative Annual Dth (Millions) 2 100% Incentives 75% Incentives 50% Incentives



### 1.2.2.2 Commercial Sector Figure 1-8 shows the commercial end-use distribution of electricity and natural-gas savings potential through 2020. Key electric end uses include lighting, cooli ng, and data-center measures. Heating and water heating are the primary natural-gas end uses in terms of potential.

DSM Market Potential Assessment 1–10

### Xcel Energy Colorado March 12, 2010 

### Figure 1-8 Commercial Savings Potential by End Use (2020) Electricity Natural Gas

913

159

339

90

102

19

161

44

44

25 665

102

138

39

65

19

121

29

20

18 423

53

65

17

38

19

64

20

8

13 0 200 400 600 800 1,000 Indoor Lighting
Outdoor Lighting
Cooling

Ventilation
Refrigeration
Office Equipment
Data Center/Server Water Heating
Vending Machines
Cooking

Cumulative Annual GWh 100% Incentives 75% Incentives 50% Incentives 11.4

4.0

0.3

4.8 4.0

1.2

0.1

1.7 1.8

0.4

0.1

1.0

0 2 4 6 8 10 1 Heating

Water Heating

Cooking

Whole Bldg (New Constr)

Cumulative Annual Dth (Millions) 2 100% Incentives 75% Incentives 50% Incentives



### 1.2.2.3 Industrial Sector Figure 1-9 shows the industrial end-use distribution of electricity and natural-gas savings potential through 2020. Key electric end uses include pumping, lighting, and compressed air. Boilers and process heating account for most of the natural-gas potential.

DSM Market Potential Assessment 1–11

### Xcel Energy Colorado March 12, 2010 

### Figure 1-9 Industrial Savings Potential by End Use (2020) Electricity Natural Gas

55

39

133

19

7

7

17

97

2 48

24

106

10

4

5

9

78

1 40

14

70

7

2

3

5

43

0 0 20 40 60 80 100 120 140 Compressed Air

Fans
Pumps

Drives
Heating
Refrigeration
Cooling
Lighting

Other

Cumulative Annual GWh 100% Incentives 75% Incentives 50% Incentives 0.06

0.02

0.06 0.05

0.01

0.03 0.03

0.00

0.02

0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 Boiler

HVAC

Process Heat

Cumulative Annual Dth (Millions) 100% Incentives 75% Incentives 50% Incentives



## 1.2.3 Demand Response Results Xcel Energy runs DR programs: a residential direct load control program, a non-residential direct load control program, targeted to medium-sized customers th at is contracted out to a third party implementer, and an interruptible tariff program that is targeted at large customers. The residential direct load control program is currently saving about 101 MW per year and could be expanded to about 211 MW per year if Xcel Energy can capture about 50 percent of the residential central air conditioning market. The nonresidential direct load control program is currently savings about 20 MW per year and is in the process of being expanded to 40 MW. Xcel Energy does not see much added potential for expanding the program further. The interruptible tariff program is currently savings about 179 MW per year, and Xcel Energy believes it can expand this program to about 227 MW per year. Table 1-5 summarizes impacts and costs for a continuation of the current Xcel En ergy programs (the business-as-usual scenario) and for an expansion of the current progr ams (expanded business-as-usual).

DSM Market Potential Assessment 1–12

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–13 

### Table 1-5 Summary of Demand Response Potentials for (2010-2020) Scenario Result Business-as-Usual (BAU) Expanded BAU Net Peak Demand Savings - MW 300 478 Program Costs - Real, $ Million Administration $14 $20 Marketing $13 $19 Third-Party $16 $32 Incentives $300 $464 Total $343 $535 PV Avoided Cost Benefits $494 $646 PV Mkt, Admin, and 3rd Party Costs $30 $49 PV Net Equipment Costs $44 $65 TRC Ratio 6.7 5.7

PV (present value) of benefits and costs is calculated using a nominal disc ount rate = 7.9 percent, inflation rate = 1.5 percent; MW savings are cumulative through 2020.


## 1.2.4 Behavioral-conservation Results We assessed two types of behavioral-conservation ac tivities for the study: (1) indirect feedback approaches, which utilize energy information reports th at motivate customers to use less, and (2) direct feedback interventions, such use of in-home energy -use monitors. Both of these approaches have shown some promise in motivating customers to use less ener gy. However, factors such as persistence and the expected amount of energy savings have not been t ested over a significant period of time or across a wide range of customers. The indirect feedback approaches account for 90 percent of the behavioralconservation economic potentials since they are applicab le to a much larger number of customers than the direct feedback measures. There are also significant c oncerns about the persistence of the direct feedback methods since many customers lose interest in monitoring home energy use through these devices. Hence, we focused on the indirect approach to estim ate achievable program potential. For the analysis, we allowed for two-percent energy savings at a cost of $10 per home per year and modeled three levels of effort that: (1) targeted only the hi ghest energy users; (2) targeted th e high and medium energy users; and (3) targeted all residential customers. Table 1-6 and Table 1-7 present the respective electric and gas results for the 2010-2020 period. As shown, electric behavioral-conservation potentials – if the assumptions outlined above hold up – could save between 44 and 176 GWh on annual program costs averaging between $9 million and $68 million dollars, depending on how many customers are targ eted for indirect interventions. Natural-gas

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–14 

### behavioral-conservation potentials could save between 0.46 and 1.90 million Dth on annual program costs averaging between $7.6 million and $51 million dollars , depending on the extent of program activities. Table 1-6 Achievable Potentials for Electric Behavioral Conservation (2010-2020) Scenario Result Low Large Users Only Medium: Lrg-Med Users High: All Customers Gross Energy Savings - GWh 43.7 107.4 175.8 Gross Peak Demand Savings - MW 10.7 26.3 43.1 Net Energy Savings - GWh 43.7 107.4 175.8 Net Peak Demand Savings - MW 10.7 26.3 43.1 Program Costs - Real, $ Million Administration $0.1 $0.4 $0.8 Marketing $8.4 $32.6 $67.0 Incentives $0.0 $0.0 $0.0 Total $8.6 $33.0 $67.8 PV Avoided Costs Benefits $35.1 $86.2 $141.0 PV Annual Marketing and Admin Costs $6.3 $24.2 $49.8 PV Net Measure Costs $0.0 $0.0 $0.0 TRC Ratio 5.6 3.6 2.8 PV (present value) of benefits and costs is calculated over a 20-year normalized measure life for 2010-2020 program years, nominal discount rate = 7.9 percent, inflation rate = 1.5 percent; GWh and MW savings are cumulative through 2020.



### Table 1-7 Achievable Potentials for Natural-Gas Behavioral Conservation (2010-2020) Scenario Result Low Large Users Only Medium Lrg-Med Users High All Customers Gross Energy Savings - Millions of Dth 0.46 1.29 1.90 Net Energy Savings - Millions of Dth 0.46 1.29 1.90 Program Costs - Real, $ Million Administration $0.1 $0.4 $0.8 Marketing $7.4 $28.6 $50.5 Incentives $0.0 $0.0 $0.0 Total $7.6 $29.0 $51.0 PV Net Avoided Costs Benefits $25.0 $70.5 $104.1 PV Annual Marketing and Admin Costs $5.6 $21.3 $37.4 PV Measure Costs $0.0 $0.0 $0.0 TRC Ratio 4.4 3.3 2.8 PV (present value) of benefits and costs is calculated over a 20-year normalized measure life for 2010-2020 program years, nominal discount rate = 7.9 percent, inflation rate = 1.5 percent; GWh and MW savings are cumulative through 2020.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–15 

## 1.2.5 Emerging Technology Results The ultimate impacts and timing of emerging technol ogies are very uncertain due to both technological and market barriers. Despite these uncertainties associ ated with particular technologies, we know that energy-efficiency measures will continue to evolve , and emerging technologies will play a significant role in future program years. Examples of some emerging technologies that might become available over the next 10 years include: energy-efficient smart windows, automated fault detection of air conditioners, night ventilation cooling systems, evaporative pre- condensers for air conditio ners, advanced cooling refrigerants, advanced controls and sensors for indu stry, microwave processing of materials, and indirect evaporative cooling in the commercial sector. In order to address the possible effects of emerging energy-efficiency measures, we focused our potential analysis on several of the more promising emerging technologies:

• 

### LED lighting, including LED street lighting, LED replacements for incandescent/CFL lighting in the residential sector, and LED replacements for fluorescent tube lighting in the commercial sector;

• 

### Induction street lighting, which is somewhat less e fficient and also less costly than LED lighting;

• 

### Fiber-optic refrigeration display lighting; and

• 

### Indirect evaporative cooling in the residential sector. For the analysis, we assumed that these measures we re all commercially available and could provide claimed savings. We also assumed equipment costs that made these measures commercially viable. Figure 1-10 and Figure 1-11 show the effects on economic pot ential (energy and peak demand, respectively) from the addition of emerging technologies. Overall, economic potential increases by 1,800 GWh (24 percent) and 628 MW (36 percent) when emerging technologies are considered. Economic potential for energy savings increases by about the same rate for the residential and commercial sectors, but economic peak-demand potential increases most in th e residential sector (61 percent for the residential sector compared to 15 percent in the commercial sect or) as a result of the indirect evaporative cooler measure. We expect that up to 55 percent of the energy savings from emerging technologies could be achieved through programs over an 11-year period on ce these technologies are proven to be commercially viable.

### Xcel Energy Colorado March 12, 2010 

### Figure 1-10 Electric Energy Economic Potentials with Emerging Technologies (11 Years)

2,813 4,145 7,563

3,610 5,148 9,363

0 2,000 4,000 6,000 8,000 10,000 12,000

Residential Commercial TotalCumulative Annual GWh Base With Emerging Tech



### Figure 1-11 Peak-Demand Economic Potentials with Emerging Technologies (11 Years)

818 826 1,730 1,320 952 2,358

0 500 1,000 1,500 2,000 2,500 3,000

Residential Commercial TotalCumulative Peak MW Base With Emerging Tech



## 1.2.6 Sensitivity to Higher Avoided-Cost Forecasts The avoided cost assumptions used in the potential study are based on the marginal energy cost forecast that Xcel Energy Developed in October 2009. This forecast also detailed the annual commodity cost assumption used each year for gas. This new for ecast resulted in a reduction from the assumptions used

DSM Market Potential Assessment 1–16

### Xcel Energy Colorado March 12, 2010 

### in the 2009-2010 DMS Plan in the marginal energy co sts used in electric avoided cost assumptions, and a reduction in the gas volumetric costs and retail rates, for years 2010-2038. In addition to the analysis we de veloped using the Xcel Energy Oct ober 2009 avoided-cost forecast, we tested the sensitivity of our analysis to higher avoi ded costs by also examining potentials under the 2009- 2010 DSM Plan avoided costs, which reflect a higher value of energy efficiency. For the higher cost scenario, we utilized electric costs that were about 35 percent higher than base costs and gas costs that were about 40 percent higher than base costs. Figure 1-12 and Figure 1-13 show how electric and gas economic potentials change as a result of the higher avoided-cost assumptions. Electric potentials increase by about 3.5 percent and gas potentials in crease by about 5.1 percent. These changes are not large since many of the studied measures were alread y cost effective in the base avoided-cost scenario. Table 1-8 provides a comparison of cumulative achievable potentials to 2020 for the base and high cost scenarios. Results are shown by sector and by progr am scenario. Overall, naturally occurring energy efficiency increases 25% for electricity and 30% for natural gas in the high cost scenario, as the higher energy prices make energy efficiency investments mo re attractive to customers, even without Xcel Energy programs. Program potentials also increase, in most cases, as the higher cost of energy makes it easier for Xcel Energy to promote energy efficiency. The increase is higher for natural-gas potentials. For the electric 100-percent incentives scenario, progra m potentials actually decrease slightly in the high cost scenario, as the effects of naturally occurri ng energy efficiency outweigh program effects. Figure 1-12 Economic Electric Potentials by Avoided-Cost Scenario (2020)

7,563 GWh

1,730 MW 7,823 GWh

1,794 MW

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

Energy Savings Potential Peak Demand Potential Base Avoided Cost High Avoided Cost



### DSM Market Potential Assessment 1–17

### Xcel Energy Colorado March 12, 2010 

### Figure 1-13 Economic Gas Potentials by Avoided-Cost Scenario (2020)

39 Million Dth 41 Million Dth

0 10 20 30 40 50 60 70

Base Avoided Cost High Avoided CostCumulative Annual Dth (Millions)



### Table 1-8 Comparison of Achievable Energy Potentials for Base and High Avoided Cost Scenarios Cumulative to 2020 Program GWh by Cost Scenario Million Dth by Cost Scenario Sector Scenario Base High % Chg Base High % Chg Residential 50% Incentive 565 616 9% 3.299 4.467 35% 75% Incentive 866 964 11% 6.975 8.934 28% 100% Incentive 2,045 2,056 1% 20.493 21.854 7% Naturally Occurring 311 390 25% 0.468 0.745 59% Commercial 50% Incentive 1,054 1,153 9% 1.131 1.253 11% 75% Incentive 1,654 1,715 4% 1.977 2.197 11% 100% Incentive 2,473 2,439 -1% 3.739 3.831 2% Naturally Occurring 754 922 22% 1.082 1.277 18% Industrial 50% Incentive 184 211 15% 0.052 0.060 16% 75% Incentive 285 286 0% 0.087 0.094 8% 100% Incentive 374 349 -7% 0.136 0.138 1% Naturally Occurring 79 119 50% 0.035 0.046 32% Total 50% Incentive 1,802 1,979 10% 4.483 5.781 29% 75% Incentive 2,806 2,965 6% 9.039 11.224 24% 100% Incentive 4,892 4,845 -1% 24.369 25.823 6% Naturally Occurring 1,144 1,431 25% 1.585 2.068 30%



### DSM Market Potential Assessment 1–18

### Xcel Energy Colorado March 12, 2010 

## 1.2.7 Comparison to Other Analyses Figure 1-14 provides a comparison of the results from the cu rrent DSM potential study with those of the previous study, completed in 2006. The figur e shows average annual GWh savings and associated average annual program costs. (Only the 50-percent and 75-percent incentive scenarios are presented because a 100-percent incentive scenario was not deve loped for the 2006 study.) As shown, energy savings increase by 81 percent in th e 50-percent incentives scenario and by 32 percent in the 75-percent incentives scenario. Program costs increase by 122 percent and 66 percent in the 50-percent and 75- percent incentives scenarios, respectively. Figure 1-14 Comparison of Current DSM Potential Study to the 2006 DSM Potential Study Average Annual Savings and Program Costs Energy Savings Program Costs

90.7 193.0 163.8 255.1

0 50 100 150 200 250 300

50% Incentives 75% Incentives ScenarioAverage Annual GWh Previous Study Current Study

$19.4 $52.3 $43.1 $87.0

$0 $10 $20 $30 $40 $50 $60 $70 $80 $90 $100

50% Incentives 75% Incentives ScenarioAverage Program Costs ($ Millions) Previous Study Current Study



### Table 1-9 provides a comparison of savings and program costs for the current DSM potential study and Xcel Energy’s current DSM plan. As the table shows, the Xcel Energy electric plan estimates fall in between this study’s 50-percent and 75-percent incentives scenarios. The Xcel Energy gas plan comes in very close to this study’ s 50-percent incentives scenario.

DSM Market Potential Assessment 1–19

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–20 

### Table 1-9 Comparison of Current DSM Potential Study to the Current Xcel Energy DSM Plan Average Annual Savings and Program Costs Electric Natural Gas Scenario / Study GWh Program Cost ($ Million) Million Dth Program Cost ($ Million) 50% Incentives 163. 8 $43.1 0.41 $13.5 75% Incentives 255. 1 $87.0 0.82 $32.4 Plan 237.5 $55.5 0.40 $12.8



## 1.2.8 Uncertainty of Results We want to caution the reader that there is inherent uncertainty in the results presented in this report because they are forecasts of what could happen in the future. Our estimates of technical and economic potential have the lowest degree of uncertainty. Thes e are estimates that account for savings, costs, and current saturations of DSM measures but do not factor in human behavior. The achievable program estimates do take into account behavior, as our modeling efforts try to predict program participation levels while factoring in measure awareness and economics, as well as barriers to measure uptake. Hence, the uncertainty in our achie vable potential estimates is greater. This uncertainty is lowest in the 50-percent incentive scenario as these results are most consistent with current program experience. Uncertainty is higher in the 75-pe rcent and 100-percent incentive scenarios, as these are projections that extend beyond the bulk of historical e xperience. This uncertainty is greatest for the 100- percent incentive scenario because we have no “real world” program experience where all the incremental measure costs are paid for by the utility over an extended period of time. Typically, a utility may offer the equivalent of 100-percent incentives for limite d measures and customer segments in order to overcome high barriers in specific markets and to ga in a high level of program participation while limiting program costs. 

# 1.3 Conclusions As the results of this study indicate, there is a si gnificant amount of energy efficiency potential remaining in the Xcel Energy Colorado service territory. Fo r electricity, the residential and commercial sectors provide the largest sources of potential savings.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–21 

### Key residential end uses, in terms of potentials, in clude cooling, lighting, and refrigeration. Wholebuilding new construction measures are also a source of large potential savings. It may be necessary to offer fairly large incentives to captu re the largest amounts of residential electricity savings potential, as our modeling results show the largest jump in savings coming when incentives are increase above 75 percent of incremental measure cost. Plug loads, home entertainment equipment, and home office equipment also provide a significant of energy savi ngs potential, but use of customer incentives for measures in these end uses does not appear to be the way to go as there is usually very little cost differential between standard-efficiency and high-ef ficiency equipment. Customer education and upstream activities are probably more useful appro aches to increase the availability and purchases of more efficient electronic equipment. In the commercial sector, lighting and cooling continue to provide the largest sources of electric energy efficiency potential. Data center and server measur es also appear to be a growing source of potential energy savings. Xcel Energy’s demand response programs will continue to be a large source of peak demand savings. These programs account for over half the savings potential in the 50-percent incentive scenario, and provide a substantial source of savings potential in all program scenarios. The residential sector is by far the largest source of na tural-gas savings potential. (Note that gas transport customers were excluded from our analysis, and hen ce the residential sector comprises about 70 percent of the gas consumption under study.) The key reside ntial end uses are space heating and water heating, and key measures include high efficiency water h eaters, furnaces and boilers as well as building shell measures such as insulation and weatherization. R esidential new construction measures also provide a large source of potential natural-gas savings. Similar to the electric findings, it may take fairly large incentives to capture high levels of residential gas potential. Behavioral conservation activities may also play a role in reducing energy consumption in Xcel Energy’s service territory. However, the persistence of beha vior-oriented measures has not been tested over an extended period of time, so continued evaluation of behavioral con servation programs will be necessary to ensure that savings don’t dissipate over time. Emerging technologies will play an increasing role in the energy efficiency portfolio as traditional measures reach high market saturation levels. It will be useful for Xcel Energy to run pilot programs to test both the technical effectiveness and the market acceptance of emerging technologies before rolling out full scale programs. Finally, we investigated the effectiveness of whole-house retrofit programs on increasing energy efficiency potential in the Xcel Energy market. We’ve concluded that whole-house treatments will not

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 1–22 

### increase the identified potentials we developed in th is study using our bottom up methodology. Rather, they may provide a way to reduce program costs by ma ximizing the effects of customer outreach efforts. Xcel Energy should explore ways to bundle retrofit measures into a comprehensive program offering. Pilot program costs should be carefully tracked to determine if a whole-house approach can provide savings over traditional measure-specific delivery of energy efficiency services.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 2–1 

# 2. Introduction 2.1 Overview In its 2009-2010 Biennial DSM Plan, filed in A ugust 2008, Public Service proposed to conduct a combined electric and natural-gas DSM market potential study in time to inform its next Biennial Plan to be filed in summer 2010 and its next Resource Plan to be filed in 2011. The study will: 

## 1. Help determine how much electric and natural-gas technical, economic, achievable (market), and naturally occurring potential exists within X cel Energy’s Colorado service territory for costeffective energy-efficiency and demand-response resources. 

## 2. Be used to inform the company’s Resource Plan in 2011 as well as subsequent biennial filings in 2010 and to comply with directives from the COPUC in Decision C08-560. 

## 3. Assist in establishing mechanisms by which th e company can continuously evaluate opportunities for cost-effective DSM, including but not limited to financial modeling. KEMA, Inc. (KEMA) was retained to conduct this demand-side management (DSM) market potential study. The study provides estimates of potential el ectricity and peak-demand savings and natural-gas savings from DSM measures in Xcel Energy’s Colora do service territory. For electric potentials, this study is an update of work that was performed by KEMA in the 2005-2006 period. The scope of this study includes new and existing residential and nonresidential buildings, as well as industrial process savings. The study covers an 11-y ear period spanning 2010-2020. Given the near- to mid-term focus, the base study was restricted to DS M measures that are presently commercially available. A number of measures were evalua ted as emerging technologies, for example LED lighting. While commercially available, these products are characterized by limited availability, low consumer awareness, uncertainty about average energy savings, and high current costs that have the potential to drop significantly with market adoption. Unit energy savin gs and cost inputs for these measures are near-term (2-3 year) forecasts, based on current trends. Data for the study come from a number of different sources, including primary data collected for this project, on-site data collected in 2005 for the pr evious DSM assessment, secondary sources that include internal Xcel Energy studies and data, as well as a va riety of information from third parties. The primary data collection effort for this study involved 300 residential phone surveys and 303 commercial phone surveys.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 2–2 

# 2.2 Study Approach This study involved identification and developm ent of baseline end-use and measure data and development of estimates of future energy-efficien cy impacts under varying levels of program effort. Residential phone surveys and commercial phone surveys were utilized, in conjunction with information from secondary sources, to aid in developm ent of the baseline and measure data. The baseline characterization allowed us to identify th e types and approximate sizes of the various market segments that are the most likely sources of DSM potential in Xcel Energy’s Colorado service territory. These characteristics then served as inputs to a m odeling process that incorporated Xcel Energy energycost parameters and specific energy-efficiency measure characteristics (such as costs, savings, and existing penetration estimates) to provi de more detailed potential estimates. To aid in the analysis, we utilized the KEMA DSM ASSYST TM model. This model provides a thorough, clear, and transparent documentation database, as well as an extremely efficient data processing system for estimating technical, economic, and achievable pot ential. We estimated technical, economic, and achievable program potential for the residential, co mmercial, and industrial sectors, with a focus on energy-efficiency impacts over the next 10 years. To estimate demand response (DR) impacts, we reviewed impacts from the Federal Energy Regulatory Commission’s 2009 National Assessment of Demand Response Potential 4 

### for the State of Colorado and customized the results to the Xcel Energy Colo rado service territory, utilizing information on Xcel Energy’s peak demand relative to the Colorado peak demand and information on current programs being run by Xcel Energy. 

# 2.3 Layout of the Report Section 3 discusses the methodology and concepts used to develop the technical, economic, and achievable potential estimates. Section 4 provides baseline results developed for the study. Section 6 discusses the results of the electric en ergy-efficiency potential analysis by sector and over time. Section 6 presents similar results for gas energy-efficiency po tential. Section 7 presents demand-response potential results.

4 

### A National Assessment of Demand Response Potential , Staff Report, Federal Energy Regulatory Commission, prepared by The Brattle Group, Freeman, Sullivan & Co., and Global Energy Partners, LLC, June 2009

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 2–3 

### The report contains the following appendices:

• 

### Appendix A: Detailed Methodology and Mode l Description—Further detail on what was discussed in Section 2.

• 

### Appendix B: Measure Descriptions—Describes the measures included in the study.

• 

### Appendix C: Economic Inputs—Provides avoided cost , electric rate, discount rate, and inflation rate assumptions used for the study.

• 

### Appendix D: Building and TOU Factor Inputs—Shows the base household counts, square footage estimates for commercial building types, and b ase energy use by industrial segment. This appendix also includes time-of-use factors by sector and end-use.

• 

### Appendix E: Measure Inputs—Lists the electric meas ures included in the analysis with the costs, estimated savings, applicability, and estimated current saturation factors.

• 

### Appendix F: Measure Inputs—Lists the natural-g as measures included in the analysis with the costs, estimated savings, applicability, a nd estimated current saturation factors.

• 

### Appendix G: Non-Additive Measure Level Resu lts—Shows energy-efficiency potential for each measure independent of any other measure.

• 

### Appendix H: Supply-Curve Data—Shows the data behind the energy supply curves provided in Section 1 of the report.

• 

### Appendix I: Achievable Program Potential—Provi des the forecasts for th e achievable potential scenarios.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 3–1 

# 3. Methods and Scenarios This section provides a brief overview of the concepts , methods, and scenarios used to conduct this study. Additional methodological details are provided in Appendix A. 

# 3.1 Characterizing the Energy-Efficiency Resource Energy efficiency has been charact erized for some time now as an alternative to energy supply options, such as conventional power plants that produce electric ity from fossil or nuclear fuels. In the early 1980s, researchers developed and popularized the use of a conservation supply-curve paradigm to characterize the potential costs and benefits of energy con servation and efficiency. Under this framework, technologies or practices that reduced energy use thr ough efficiency were characterized as “liberating ‘supply’ for other energy demands” and could therefor e be thought of as a resource and plotted on an energy supply curve. The energy-efficiency resource paradigm argued simply that the more energy efficiency or “nega-watts” produced, the fewer new pl ants would be needed to meet end-users’ power demands. 

## 3.1.1 Defining Energy-Effi ciency Potential Energy-efficiency potential studies were popular throughout the utility industry from the late 1980s through the mid-1990s. This period coincided with the a dvent of what was called least-cost or integrated resource planning (IRP). Energy-efficiency potential studies became one of the primary means of characterizing the resource availability and value of energy efficiency within the overall resource planning process. Like any resource, there are a number of ways in wh ich the energy-efficiency resource can be estimated and characterized. Definitions of energy-efficiency potential are similar to definitions of potential developed for finite fossil-fuel resources, like coal, oil, and natural gas. For example, fossil-fuel resources are typically characterized along two primary dimensi ons: the degree of geological certainty with which resources may be found and the likelihood that ex traction of the resource will be economic. This relationship is shown conceptually in Figure 3-1

. Somewhat analogously, this energy-efficiency potential study defines several different types of energyefficiency potential , namely, technical, economic, achievable program, and naturally occurring. These potentials are shown conceptually in Figure 3-2 and described below.

• 

### Technical potential is defined in this study as the complete penetration of all measures analyzed in applications where they were deemed technically feasible from an engineering perspective.

### Xcel Energy Colorado March 12, 2010 

### Figure 3-1 Conceptual Framework for Estimates of Fossil Fuel Resources

Decreasing Economic FeasibilityDecreasing Certainty of Existence Possible and Economically Feasible Possible but not Economically Feasible

Known but not Economically Feasible Known

and Economically Feasible



### • 

### Economic potential refers to the technical potential of those energy conservation measures that are cost effective when compared to supply-side alternatives.

• 

### Achievable program potential refers to the amount of savings that would occur in response to specific program funding and measure incentive levels. Savings associated with program potential are savings that are projected beyond tho se that would occur naturally in the absence of any market intervention.

• 

### Naturally occurring potential refers to the amount of savings estimated to occur as a result of normal market forces; that is, in the absence of any utility or govern mental intervention.

DSM Market Potential Assessment 3–2

### Xcel Energy Colorado March 12, 2010 

### Figure 3-2 Conceptual Relationship among Energy-Efficiency Potential Definitions

Achievable Program Technical Economic
Naturally Occurring



# 3.2 Summary of Analytical Steps Used in this Study The crux of this study involves carrying out a number of basic analytical steps to produce estimates of the energy-efficiency potentials introduced above. The b asic analytical steps for this study are shown in relation to one another in Figure 3-3 . The bulk of the analytical process for this study was carried out in a model developed by KEMA for conducting energy-eff iciency potential studies. Details on the steps employed and analyses conducted are described in Appendix A. The model used, DSM ASSYST TM , is a Microsoft Excel ® 

### -based model that integrates technology-speci fic engineering and customer behavior data with utility market saturation data, load shapes, rate projections, and marginal costs into an easily updated data management system.

DSM Market Potential Assessment 3–3

### Xcel Energy Colorado March 12, 2010 

### Figure 3-3 Conceptual Overview of Study Process
Building Data End Use Saturation End Use Consumption Loadshapes Building ft 2 , # Homes

Building Data End Use Saturation End Use Consumption Loadshapes Building ft 2 , # Homes Measure Data Costs Savings Current Saturation

Program Data and Adoption Inputs Economic Potential Technical Potential

Naturally Occurring Efficiency Model Inputs

S c e n a r i o s Economic Data

Avoided Costs Rates Discount/Inflation Rate

Achievable Program Potential 

### The key steps implemented in this study are: Step 1: Develop Initial Input Data

• 

### Develop a list of energy-efficiency measure opport unities to include in scope. In this step, an initial draft measure list was developed and circul ated internally within Xcel Energy and to an external advisory group. The final me asure list was developed after incorporating comments.

• 

### Gather and develop technical data (costs and savings) on e fficient measure opportunities. Data on measures were gathered from a variety of sources. Measure descriptions are provided in Appendix B, and detail on measure i nputs is provided in Appendix E.

• 

### Gather, analyze, and develop information on bu ilding characteristics, including total square footage or total number of households, energy c onsumption and intensity by end use, end-use consumption load patterns by time of day and y ear (i.e., load shapes), market shares of key electric consuming equipment, and market shares of energy-efficiency technologies and practices. Section 4 of this report describes the baselin e data developed for this study. To aid in development of baseline data for th e project, two primary data collection efforts were undertaken: a phone survey of 300 r esidential homes and a phone survey of 303 commercial establishments.

DSM Market Potential Assessment 3–4

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 3–5 

### • 

### Collect data on economic parameters: avoided co sts, electricity rates, discount rates, and inflation rate. These inputs are provided in Appendix C of this report. Step 2: Estimate Technical Potential and Develop Supply Curves

• 

### Match and integrate data on efficient measures to data on existing building characteristics to produce estimates of technical potential and energy-efficiency supply curves. Step 3: Estimate Economic Potential

• 

### Match and integrate measure and building data with economic assumptions to produce indicators of costs from different viewpoints (e.g., societal and consumer).

• 

### Estimate total economic potential. Step 4: Estimate Achievable Program and Naturally Occurring Potentials

• 

### Screen initial measures for inclusion in the pr ogram analysis. This screening may take into account factors such as cost effectiveness, poten tial market size, non-energy benefits, market barriers, and potentially adverse effects associat ed with a measure. For this study, measures were screened using the total-resource-cost t est, while considering only electric avoided-cost benefits.

• 

### Gather and develop estimates of program costs (e.g., for administration and marketing) and historic program savings.

• 

### Develop estimates of customer adoption of energy-efficiency measures as a function of the economic attractiveness of the measures, barriers to their adoption, and the effects of program intervention.

• 

### Estimate achievable program a nd naturally occurring potentials. Step 5: Scenario Analyses

• 

### Recalculate potentials under alternate program scenarios. 

# 3.3 Scenario Analysis Scenario analysis is a tool commonly used to st ructure the uncertainty and examine the robustness of projected outcomes to changes in key underlying assumptions. This section describes the alternative scenarios under which demand-side management (DSM ) potential was estimated in this study. We developed these scenarios of DSM potential for two key reasons: 

## 1. Our estimates of potential depend on future adopti ons of energy-efficiency measures that are a function of data inputs and assumptions, which are themselves forecasts. For example, our projections depend on estimates of measure ava ilability, measure cost, measure savings, measure

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 3–6 

### saturation levels, retail rates, and avoided costs. E ach of the inputs to our analysis is subject to some degree of uncertainty. 

## 2. The ultimate achievable energy-efficiency poten tial depends, by definition, on policy choices, including the level of resources and strate gies used to increase measure adoption. The cost components of program funding that vary under each scenario include: Marketing and Education Expenditures

• 

### Customers must be aware of efficiency measur es and their associated benefits in order to adopt those measures. In our analysis, progr am marketing expenditures are converted to increases in awareness. Thus, under higher levels of marketing expenditures, higher levels of awareness are achieved. Incentives and Direct Implementation Expenditures

• 

### The higher the percentage of measure costs paid by the program, the higher the participants’ benefit-cost ratios and, consequently , the number of measure adoptions. Administration Expenditures

• 

### Purely administrative costs, though necessary and important to the program process, do not directly lead to adoptions; however, they have been included in program funding because they are an input to program benefit-cost tests. For the study, the primary analysis focused a base ca se consisting of commercially available, established efficiency technologies. In addition to this base analysis, we analyzed:

• Emerging technologies

• Behavioral-conservation measures

• Demand response For each analysis, three program-funding scenarios we re considered: a 50-percent incentive scenario, a 75-percent incentive scenario, and a 100-percent incentive scenario. These scenario s are discussed below. In all scenarios, a number of measures were modele d without financial incentives. These include office equipment power-management enabling, industrial operations and maintenance (O&M) measures, and Energy Star office equipment and consumer electronics for the residential sector. Because these measures are very cost effective, it was deemed that provision of an incentive would primarily benefit free riders.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 3–7 

### Note for the low-income segment, all scenarios reflect 100 percent incentives (as a percent of incremental measure cost). Program effort was adjusted across scenarios such that low-income program potentials roughly track other residential program potentials. 

## 3.3.1 Fifty-percent Incentive Scenario In the 50-percent incentive scenario, base incentive levels are set to 50 percent of incremental measure costs. For the behavioral conservation program, which isn’t tied to incentives, we extended the program to cover only the largest residential energy users. Program administration budgets are set at modest amounts, roughly corresponding to minimum program support levels. Marketing/customer education budgets correspond to current Xcel Energy budgets. 

## 3.3.2 Seventy-five-percent Incentive Scenario In this scenario, incentives were increased to cover 75 percent of incremental measure costs, except for the low-income giveaway items a nd measures that had constrained in centives as discussed above. For the behavioral conservation program, we extended coverage to both the large and medium sized residential energy users. Program administration budgets were also increased for this scenario. 

## 3.3.3 One-hundred-percent Incentive Scenario In this scenario, incentives were incr eased to cover 100 percent of incremental measure costs, with the exception of constrained measures. The behavioral conservation program was extended to cover all residential customers. Program administration budgets were increased again for this scenario. 

## 3.3.4 Summary of Scenarios
Table 3-1 shows average spending on electricity program s for each of the scenarios for the 2010-2020forecast period for the base analysis, which does not include emerging technologies, behavioralconservation measures, or demand response. Table 3-2 shows average spending on natural-gas programs for the base analysis.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 3–8 

### Table 3-1 Scenario Average Spending during 2010-2020 Forecast Period ($1000s) Electric Programs % Incremental Funding Market Cost Components Measure Cost

Level Segment Admin Marketing Incentives Total Paid* 50% Residential Existing $3,286 $2,695 $2,593 $8,574 50% Incentives Residential New Construction $889 $200 $3,722 $4,811 50% Residential Low Income $126 $100 $3,684 $3,910 100% Commercial Existing $8,203 $2,048 $7,041 $17,291 50% Commercial New Construction $2,569 $600 $2,155 $5,323 50% Industrial $1,163 $600 $1,448 $3,211 50% Total $16,236 $6,243 $20,642 $43,121 75% Residential Existing $7,038 $2,695 $9,632 $19,365 75% Incentives Residential New Construction $2,479 $200 $9,506 $12,185 75% Residential Low Income $193 $200 $6,057 $6,450 100% Commercial Existing $13,204 $2,048 $19,792 $35,044 75% Commercial New Construction $3,122 $600 $4,352 $8,074 75% Industrial $1,526 $600 $3,763 $5,889 75% Total $27,563 $6,343 $53,102 $87,007 100% Residential Existing $26,670 $2,695 $62,065 $91,431 100% Incentives Residential New Construction $8,000 $200 $34,600 $42,800 100% Residential Low Income $581 $842 $10,995 $12,418 100% Commercial Existing $21,062 $2,048 $55,868 $78,977 100% Commercial New Construction $3,864 $600 $7,959 $12,423 100% Industrial $1,854 $600 $7,225 $9,679 100% Total $62,031 $6,985 $178,712 $247,728

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 3–9 

### Table 3-2 Scenario Average Spending during 2010-2020 Forecast Period ($1000s) Natural-Gas Programs % Incremental Funding Market Cost Components Measure Cost

Level Segment Admin Marketing Incentives Total Paid* 50% Residential Existing $1,021 $550 $2,444 $4,015 50% Incentives Residential New Construction $1,036 $200 $2,309 $3,546 50% Residential Low Income $129 $100 $2,958 $3,187 100% Commercial Existing $626 $240 $1,054 $1,920 50% Commercial New Construction $205 $130 $387 $721 50% Industrial $22 $20 $42 $83 50% Total $3,038 $1,240 $9,194 $13,472 75% Residential Existing $2,603 $550 $9,552 $12,705 75% Incentives Residential New Construction $2,027 $200 $6,978 $9,205 75% Residential Low Income $203 $200 $4,050 $4,452 100% Commercial Existing $1,293 $240 $3,113 $4,646 75% Commercial New Construction $267 $130 $837 $1,234 75% Industrial $36 $20 $110 $167 75% Total $6,429 $1,340 $24,641 $32,409 100% Residential Existing $8,093 $550 $48,161 $56,804 100% Incentives Residential New Construction $4,027 $200 $25,654 $29,881 100% Residential Low Income $606 $500 $9,526 $10,632 100% Commercial Existing $3,281 $240 $9,956 $13,478 100% Commercial New Construction $417 $130 $1,644 $2,191 100% Industrial $57 $20 $276 $353 100% Total $16,483 $1,640 $95,217 $113,339


## 3.3.5 Avoided-Cost Scenarios The avoided-cost assumptions used in the study are b ased on the marginal energy cost forecast that Xcel Energy developed in October 2009. This forecast also detailed the annual commodity cost assumption used each year for gas. This ne w forecast resulted in a reduction from the assumptions used in the 2009- 2010 DMS Plan in the marginal energy costs used in electric avoided cost assumptions, and a reduction in the gas volumetric costs and retail rates, for years 2010-2038. In order to test the sensitivity of the potential analysis to higher avoided costs, we also developed estimates of energy efficiency potential using the cost assumptions from the 2009-2010 DSM Plan. In this report, we refer to the most current avoided co st forecast as the base forecast and the 2009-2010 DSM Plan forecast as the high-cost forecast.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 3–10 

### 3.3.5.1 Electric Avoided Costs The electric avoided costs were developed by time-of-use (TOU) period. These periods are shown in Table 3-3

. Figure 3-4 shows the base electric avoided-cost forecast by TOU period, and Figure 3-5 shows the high electric avoided-cost forecast by TOU period. Figure 3-6 provides a comparison of the forecasts using load-weighted averages of the TOU forecasts. Ov erall, the high-cost forecast is about 35 percent higher than the base forecast. Note that both for ecasts include adders for environmental externalities (CO 2 

### and SO x 

### ) and also 10-percent adders for non-energy bene fits (20-percent adders for the low-income market segment). In addition to energy avoided cost s, capacity avoided costs are included in the analysis, starting at $179 per kW and increasi ng by about 3.3 percent per year. Table 3-3 Electric Time-of-Use Period Definitions TOU Period Weekday Hours Weekend Hours Summer Off-Peak 0:01-6:00 0:01-8:00 Summer Mid-Peak 6:01-7:00, 23:01 -24:00 8:01-9:00, 22:01-24:00 Summer On-Peak 7:01-12:00, 17:01-23:00 9:01-22:00 Summer Super-Peak 12:01-17:00 Winter Off-Peak 0:01-6:00, 23:01 -24:00 0:01-9:00, 23:01-24:00 Winter On-Peak 6: 01-23:00 9:01-23:00 Summer June-September Winter October-May * Time-of-use periods were determined by analysis of t he 2009 hourly marginal costs to identify periods that have similar prices. These periods ar e independent of any billing TOU rates.

### Xcel Energy Colorado March 12, 2010 

### Figure 3-4 Electric Avoided-Cost Forecast - Base

$0.00 $0.02 $0.04 $0.06 $0.08 $0.10 $0.12 $0.14 $0.16 $0.18 $0.20

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020$ per kWh Summer Super-Peak Summer On-Peak Summer Mid-Peak Summer Off-Peak Winter On-Peak Winter Off-Peak



### Figure 3-5 Electric Avoided-Cost Forecast – High Cost

$0.00 $0.02 $0.04 $0.06 $0.08 $0.10 $0.12 $0.14 $0.16 $0.18 $0.20

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020$ per kWh Summer Super-Peak Summer On-Peak Summer Mid-Peak Summer Off-Peak Winter On-Peak Winter Off-Peak



### DSM Market Potential Assessment 3–11

### Xcel Energy Colorado March 12, 2010 

### Figure 3-6 Electric Avoided-Cost Forecast – Base-High Comparison

$0.00 $0.02 $0.04 $0.06 $0.08 $0.10 $0.12

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020$ per kWh High-Average Base-Average



### 3.3.5.2 Natural-Gas Avoided Costs Figure 3-7 shows the base and high natural gas avoided-cost forecasts. Overall, the high-cost forecast is about 40 percent higher than the base forecast. Note that both forecasts include five-percent adders for non-energy benefits. Figure 3-7 Natural Gas Avoided-Cost Forecast – Base-High Comparison

$0.00 $0.20 $0.40 $0.60 $0.80 $1.00 $1.20 $1.40

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020$ per therm High Base



### DSM Market Potential Assessment 3–12

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 4–1 

# 4. Baseline Results 4.1 Overview Estimating the potential for energy-efficiency improvem ents requires a comparison of the energy impacts of standard-efficiency technologies with those of alte rnative high-efficiency equipment. This, in turn, dictates a relatively detailed understanding of the ener gy characteristics of the marketplace. Baseline data that were required for each studied market segment includes:

• Total count of energy-consuming units (floor space of commercial buildings, number of residential dwellings, and the base kWh consumption of industrial facilities)

• Annual energy consumption for each end use studied (both in terms of total consumption in GWh and normalized for intensity on a per-unit basis (e.g., kWh/ft 2 

### )

• End-use load shapes (that describe the amount of energy used or power demand over certain times of the day and days of the year)

• The saturation of electric end uses (e.g., the frac tion of total commercial floor space with electric air conditioning)

• The market share of each base equipment type for example, the fraction of total commercial floor space served by 4-foot fluorescent lighting fixtures)

• Market share for each energy-effi ciency measure in scope (for example, the fraction of total commercial floor space already served by CFLs). Data for the baseline analysis comes from a number of sources, including Xcel Energy billing data extracts, Xcel Energy internal studies and analyses, U.S. Department of Energy studies, on-site surveys conducted for the 2006 Xcel Energy Colorado DSM asse ssment, and telephone surveys conducted as part of this project, and other secondary sources. Baselin e data sources vary by sector and are described further below. Figure 4-1 shows the overall breakdown of electricity use and peak demand by sector for the Xcel Energy Colorado service territory. The commercial sector account s for the largest share of energy usage, followed by the residential, industrial, and TCU (trans portation, communications, and utilities) sectors.

### Xcel Energy Colorado March 12, 2010 

### Figure 4-1 Electricity Usage Breakdown – Xcel Energy Colorado Service Territory

Residential 31% Ag 1% Commercial 45%

Construction 1% Industrial

12% Mining

2% TCU 5% Unclassified 3% Total Electric Use: 28,552 GWh
Source: Xcel Energy Billing Records 2008, Calibrated to 2010 Sales Forecast (from February/March 2009) 

### Figure 4-2 shows the overall breakdown of natural-gas u se by sector for the Xcel Energy Colorado service territory. Residential accounts for the largest share of natural-gas usage, followed by the commercial and industrial sectors.

DSM Market Potential Assessment 4–2

### Xcel Energy Colorado March 12, 2010 

### Figure 4-2 Natural Gas Usage Breakdown—Xcel Energy Colorado Service Territory

Residential 71% Commercial 23% Construction 1% Industrial

2%

TCU 1% Unclassified 2% Mining 0.1% Ag 0.2%

Total Gas Use: 1.348 Million Therms

Source: Xcel Energy Billing Records 2008, Calibrated to 2010 Sales Forecast (from Feb./Mar. 2009) 

# 4.2 Electricity 4.2.1 Residential For the residential sector, customer counts were provided by Xcel Energy. Dwellings were split into single-family and multifamily components using data from the Xcel Energy billing system, the Xcel Energy Residential Use Study (2004), and 300 residen tial on-site surveys that were conducted as part of this study. For the energy-efficiency potential study, we broke the residential sector into five segments:

• 

### Single family–large

• 

### Single family–medium

• 

### Single family–small

• 

### Multifamily

• 

### Low income For single-family homes, the large and small segment s are designed to comprise 20 percent of the singlefamily homes category each, and the medium segment comprises 60 percent of the single-family homes.

DSM Market Potential Assessment 4–3

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 4–4 

### The saturation analysis to derive percentage of hom es that have a given end use was conducted using the most recent Xcel Energy Home Use Study. UECs (energy use per applian ce) were developed using secondary source data. Household estimates for each segment were based on analysis of the Home Use Study. Load-shape data from Xcel Energy and KEMA end-u se databases were utilized to allocate annual energy usage to Xcel Energy’s time-of-use (TOU) periods. P eak period usage, developed on a sector-specific and end-use basis, was calibrated to equal the Xcel Energy summer peak. Table 4-1 (energy) and Table 4-2 (peak demand) summarize the residential baseline electricity consumption results developed for the study. Figure 4-3 shows the breakdown of electricity use by residential segment. Figure 4-4 breaks down electricity use by end use. Overall consumption for energy and peak demand by customer segment is shown in Figure 4-5 . Although the small single-family and large single-family segments represent the same number of homes, the energy use for the large single-family segment is more than four times that of small single-family homes, and peak demand is almost seven times as high. Figure 4-6 shows energy use and peak demand by end use. Overall, lighting and cooling are the largest end uses in terms of electricity consumption, each with over 1,500 GWh, followed by miscellaneous, refrigeration, and TVs/entertainment. Central air cond itioning (CAC) is the largest end use in terms of peak demand, with six times the peak of the next largest end use.Xcel Energy ColoradoMarch 12, 2010Table 4-1Residential Baseline Consumption Summary, Electricity – kWh, 2010End UseSaturation UEC Avg Use Saturation UECAvg Use Saturation UEC Avg Use Saturation UEC Avg Use Saturation UEC Avg UseSplit-System Air Conditioner0.56 3,8802,169 0.49 1,514741 0.26 572148 0.40 1,922765 0.36 1,391504Room Air Conditioner0.08 1,941163 0.0575835 0.06 28618 0.18 960168 0.09 69663Evaporative Cooler0.25 2,191539 0.27578157 0.30 12538 0.04 80730 0.20 709143Dehumidifier0.16 40764 0.0627515 0.06 1579 0.07 34024 0.20 25351Furnace Fan--Furnace + CAC0.52 1,796939 0.47765357 0.26 28474 0.29 792228 0.36 702254Resistance Space Heating0.13 4,363563 0.07 1,866131 0.04 69230 0.31 1,908589 0.09 1,714161Lighting, Std Fixt1.00 2,2282,228 1.00868868 1.00 270270 1.00 744744 1.00 897897Incandescent Downlight0.44 710312 0.44409180 0.44 11350 0.20 30461 0.44 409180Fluorescent Fixture0.60 371223 0.60214128 0.605936 0.60 12676 0.60 214128Refrigerator1.66 8111,346 1.32737972 1.11 663738 1.02 546558 1.28 737944Freezer0.76 336255 0.48336161 0.33 336110 0.22 27559 0.53 336177Water Heating0.07 3,902285 0.08 2,346176 0.11 1,205128 0.21 1,997417 0.06 2,155119Clotheswasher1.00 674673 1.00674674 0.93 674623 0.66 519343 0.79 674532Clothes Dryer0.78 526408 0.91413376 0.81 177143 0.51 329169 0.74 451336Dishwasher0.97 613595 0.93613572 0.80 312250 0.76 464354 0.84 613515Pool Pump0.06 2,629158 0.05 1,67377 0.02 3997 0.0000 0.04 1,67369Misc. Residential1.00 2,5882,588 1.00932932 1.00 373373 1.00 419419 1.00 857857CRT TV2.73 153416 1.96153300 1.5478120 1.50 153229 1.81 153276Plasma TV0.10 42443 0.1142447 0.09 21619 0.11 42445 0.20 42485Set-Top Box1.91 130248 0.98130127 0.82 130107 0.66 13086 1.25 130162DVD Player1.60 3658 1.423651 1.603658 1.01 3637 1.373649Desktop PC1.77 237419 1.34237317 0.81 237192 0.83 237197 1.02 237242Laptop PC0.18 7213 0.187213 0.187213 0.14 7210 0.147210Cooking0.86 349300 0.78302234 0.66 251165 0.88 255224 0.94 302283Use Per Home15,0067,6423,7185,8317,036Homes158,525475,574158,525303,81359,094Total Use2,378,776,8973,634,268,607589,385,4291,771,538,637415,784,005Low IncomeSingle Family LargeSingle Family MediumSingle Family SmallMultifamilySource: Xcel Energy Billing Data-2008, Xcel Energy Home Use Data-2008, KEMA Analysis, Calibrated to 2010 Sales Forecast (fromFeb/Mar 2009)DSM Market Potential Assessment4–5Xcel Energy ColoradoMarch 12, 2010Source: Xcel Energy Billing Data-2008, Xcel Energy Home Use Data-2008, KEMA Analysis, Calibrated to 2010 Peak Demand Forecast(from Oct 2009)End UseHomes withEnd Use All homesHomes withEnd Use All homesHomes withEnd Use All homesHomes withEnd Use All homesHomes withEnd Use All homesSplit-System Air Conditioner3.897 2.178 1.625 0.795 0.638 0.165 1.847 0.735 1.551 0.562Room Air Conditioner1.949 0.164 0.813 0.037 0.319 0.020 0.923 0.162 0.776 0.070Evaporative Cooler1.293 0.318 0.539 0.147 0.212 0.064 0.776 0.029 0.596 0.120Dehumidifier0.057 0.009 0.041 0.002 0.024 0.001 0.045 0.003 0.039 0.008Furnace Fan--Furnace + CAC0.855 0.447 0.389 0.182 0.150 0.039 0.361 0.104 0.371 0.134Resistance Space Heating0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000Lighting, Bulbs0.209 0.209 0.119 0.119 0.051 0.051 0.088 0.088 0.105 0.105Fluorescent Fixture0.039 0.023 0.022 0.013 0.010 0.006 0.012 0.007 0.022 0.013Refrigerator0.111 0.184 0.101 0.133 0.091 0.101 0.075 0.076 0.101 0.129Freezer0.047 0.035 0.047 0.022 0.047 0.015 0.038 0.008 0.047 0.025Water Heating0.496 0.036 0.318 0.024 0.170 0.018 0.243 0.051 0.304 0.017Clotheswasher0.011 0.011 0.010 0.010 0.007 0.007 0.007 0.005 0.010 0.008Clothes Dryer0.069 0.054 0.055 0.050 0.032 0.026 0.043 0.022 0.060 0.044Dishwasher0.031 0.030 0.026 0.025 0.020 0.016 0.020 0.015 0.026 0.022Pool Pump0.292 0.018 0.186 0.009 0.044 0.001 0.000 0.000 0.186 0.008Misc. Residential0.293 0.293 0.119 0.119 0.039 0.039 0.021 0.021 0.114 0.114TV0.026 0.044 0.019 0.029 0.011 0.017 0.016 0.024 0.016 0.029Big Screen TV0.093 0.060 0.067 0.031 0.040 0.017 0.057 0.027 0.057 0.023Set-Top Box0.017 0.029 0.017 0.016 0.017 0.031 0.017 0.026 0.017 0.028DVD Player0.005 0.007 0.005 0.007 0.005 0.007 0.005 0.005 0.005 0.006Desktop PC0.030 0.053 0.029 0.039 0.023 0.019 0.027 0.022 0.027 0.027Laptop PC0.008 0.001 0.008 0.001 0.008 0.001 0.008 0.001 0.008 0.001Cooking0.057 0.049 0.049 0.038 0.041 0.027 0.042 0.037 0.049 0.046Use Per Home4.2541.8470.6901.4681.539Homes145,627416,842129,697253,377210,000Total Use619,520769,87389,479371,835323,167Single Family Large Single Family Medium Single Family SmallMultifamilyLow IncomeTable 4-2Residential Baseline Peak Demand Summary, Electricity – kW, 2010DSM Market Potential Assessment4–6

### Xcel Energy Colorado March 12, 2010 

### Figure 4-3 Residential Electricity Shares by Segment, 2010

Single Family Large 25% Single Family Medium

36% Single Family Small

5% Multifamily 17%

Low Income

17%

Source: Xcel Energy Billi ng Data-2008, Xcel Energy Home Use Data-2008, KEMA Analysis 

### Figure 4-4 Residential Electricity Shares by End Use, 2010

Cooling

17%

Dishwashe r 2% Freezer

2% Furnace Fan 6% Heating

5% Lighting

17% Misc 14% Refrigerator

12% TV-Ent 9% Water Heating 4% Cooking 3% Computer

4% Clothes Dryer 4% Clotheswasher 1%

Source: Xcel Energy Billi ng Data-2008, Xcel Energy Home Use Data-2008, KEMA Analysis



### DSM Market Potential Assessment 4–7

### Xcel Energy Colorado March 12, 2010 

### Figure 4-5 Residential Electricity Usage by Customer Segment Energy Peak Demand

0 1,000 2,000 3,000 4,000 Single Family Large Single Family

Medium Single Family Small Multifamily Low Income

GWh 0 200 400 600 800 1,000 Single Family Large Single Family

Medium Single Family Small Multifamily Low Income

MW 

### Figure 4-6 Residential Electricity Usage by End Use Energy Peak Demand

0 500 1,000 1,500 2,000 Cooking Computer

TV-Ent

Misc Dishwasher Clothes Dryer Clotheswasher Water Heating Freezer Refrigerator Lighting Furnace Fan Heating Cooling

GWh 0 200 400 600 800 1,000 1,200 1,400 Cooking Computer

TV-Ent

Misc Dishwasher Clothes Dryer Clotheswasher Water Heating Freezer Refrigerator Lighting Furnace Fan Heating Cooling

MW



### DSM Market Potential Assessment 4–8

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 4–9 

## 4.2.2 Commercial The primary sources of commercial data for the Xcel Energy Colorado service area were the U.S. DOE Commercial Building Energy Consumption Survey (CBECS) and Xcel Energy’s billed consumption data. CBECS data for the Mountain Region were used to develop end-use satur ation and EUI (Energy Utilization Indices in kWh per square foot) data as well as whole-building EUI estimates. For the commercial sector, no estimates of consuming units (square feet of commercial space by building type) were available for the Xcel Energy Colorado te rritory. Square footage estimates were developed for each key building type by dividing Xcel Energy’s energy consumption (kWh) by whole-building EUIs (kWh per square foot). Load shape data from Xcel Energy were utilized to allocate annua l energy usage to Xcel Energy’s timeof-use (TOU) periods. Peak-period usage, devel oped on a sector-specific and end-use basis, was calibrated to equal the Xcel Energy summer peak. Table 4-3 and Table 4-4 summarize the commercial baseline electricity consumption results developed for the study. Figure 4-7 shows commercial electricity consumption and peak-demand by building type. The office and miscellaneous building types account for the largest shares of both energy and peak-demand usage. Figure 4-8 shows commercial electricity consumption and peak demand by end use. Lighting contributes the most to electricity consumption at almost 6,000 GWh per year, followed by cooling and commercial miscellaneous at less than 2,000 GWh per year each. During peak demand, cooling contributes the largest share at almost 1,400 MW, followed by indoor lighting at about 800 MW.Xcel Energy ColoradoMarch 12, 2010Table 4-3Commercial Baseline Electricity Consumption FactorsSaturationOffice Retail Restaurant Grocery WarehouseSchool College Health Lodging OtherIndoor Lighting1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00Outdoor Lighting0.89 0.52 0.36 0.58 0.71 1.00 1.00 1.00 0.65 1.00Chillers0.31 0.01 0.00 0.00 0.00 0.45 0.63 0.82 0.23 0.12DX Packaged Systems 0.55 0.56 0.81 0.81 0.86 0.55 0.37 0.18 0.77 0.73Ventilation0.95 0.97 0.99 1.00 0.33 1.00 1.00 1.00 1.00 0.77Refrigeration0.12 0.11 0.99 1.00 0.28 0.67 0.66 1.00 0.51 0.25Office Equip1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00Servers-Data Centers 0.01 0.00 0.00 0.00 0.00 0.00 0.04 0.02 0.00 0.00Vending Machines0.39 0.30 0.47 0.40 0.73 0.68 0.41 0.57 0.36 0.31Cooking0.08 0.02 0.54 0.34 0.05 0.45 0.07 0.27 0.46 0.36Heating0.37 0.67 0.06 0.40 0.22 0.17 0.37 0.01 0.54 0.29Miscellaneous1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00EUI = kWh per ft2 Office Retail Restaurant Grocery WarehouseSchool College Health Lodging OtherIndoor Lighting6.7 4.0 3.1 6.2 2.8 4.1 4.3 7.0 4.3 4.8Outdoor Lighting1.2 1.1 3.2 1.7 0.3 0.8 0.2 0.4 0.5 2.1Chillers1.8 0.9 2.5 1.1 0.5 1.8 1.7 2.0 2.0 1.5DX Packaged Systems 3.1 1.5 4.3 1.9 0.9 3.1 3.0 3.5 3.5 2.6Ventilation1.8 0.6 2.0 0.7 0.2 1.0 1.0 1.5 0.6 1.1Refrigeration0.1 0.2 7.4 21.4 0.4 0.4 0.4 0.8 0.8 0.4Office Equip1.4 0.1 0.1 0.3 0.2 0.8 1.2 0.8 0.2 0.2Servers-Data Centers 100.0 83.0 83.0 83.0 83.0 100.0 100.0 100.0 100.0 100.0Vending Machines0.8 0.2 0.9 0.2 0.2 0.3 0.3 0.2 0.5 0.2Cooking2.2 1.1 1.9 0.6 0.0 1.3 1.3 0.2 3.1 1.2Heating1.5 1.1 3.0 1.6 0.2 1.6 1.6 1.3 1.9 1.5Miscellaneous1.3 0.5 3.8 1.5 0.8 0.4 0.5 2.8 1.7 1.0Office Retail Restaurant Grocery WarehouseSchool College Health Lodging OtherSquare Footage (1000's) 302,169 170,918 38,799 21,728 175,719 53,376 34,899 46,064 35,096 135,189DSM Market Potential Assessment4–10Xcel Energy ColoradoMarch 12, 2010MWhOffice Retail Restaurant Grocery Warehouse School College Health Lodging Other TotalIndoor Lighting2,039,486 677,762 120,321 135,600 487,346 219,033 151,294 324,211 149,610 645,611 4,950,274Outdoor Lighting319,254 93,077 45,223 21,417 37,255 42,128 6,962 16,618 11,456 279,087 872,475Chillers168,384 2,016000 43,629 38,121 75,390 16,314 23,946 367,799DX Packaged Systems514,765 145,847 133,883 34,145 137,445 91,814 38,302 29,325 93,833 253,273 1,472,633Ventilation508,581 92,860 77,330 15,653 13,138 53,329 34,963 70,818 21,182 116,891 1,004,745Refrigeration5,199 3,704 284,717 465,669 20,314 12,642 8,119 35,549 13,551 13,001 862,465Office Equip409,423 11,675 2,481 6,259 28,937 44,761 42,658 34,549 7,908 31,067 619,718Servers-Data Centers440,49500 5,360 38,408 24,697 149,484 79,940 7,372 58,127 803,883Vending Machines99,342 8,373 17,123 1,784 30,686 11,791 4,074 4,536 6,172 9,288 193,169Cooking52,303 3,968 40,322 4,7050 30,343 3,039 2,332 50,818 57,721 245,551Heating165,011 126,963 7,540 14,210 8,057 14,216 20,467338 35,379 58,936 451,116Miscellaneous388,738 84,499 148,418 31,756 145,719 23,584 16,215 127,035 60,133 136,816 1,162,913Total5,110,981 1,250,742 877,357 736,557 947,307 611,967 513,698 800,642 473,727 1,683,762 13,006,740MWOffice Retail Restaurant Grocery Warehouse School College Health Lodging Other TotalIndoor Lighting337.4 108.8 20.9 18.4 76.726.728.543.818.897.7777.7Outdoor Lightng3.95.42.70.50.41.50.00.10.119.233.8Chillers126.11.70.00.00.022.923.943.310.120.1247.9DX Packaged Systems385.4 123.8 85.7 23.2 136.748.224.016.857.8 212.6 1,114.2Ventilation159.5 26.7 20.53.44.210.710.014.84.634.8289.2Refrigeration0.60.5 35.1 61.83.21.41.04.21.61.6111.0Office Equip50.51.90.41.04.33.56.84.41.14.278.0Servers-Data Centers54.30.00.00.95.71.923.710.11.07.9105.6Vending Machines12.91.33.00.35.10.90.70.60.91.427.0Cooking7.00.67.40.60.02.00.50.49.28.536.2Heating10.00.80.00.00.00.21.50.00.91.414.9Miscellaneous50.2 13.2 25.24.5 24.31.82.815.68.520.2166.2Total1,197.8 284.6 200.9 114.4 260.6 121.7 123.4 154.1 114.5 429.5 3,001.7Table 4-4Commercial Baseline Electricity Consumption Summary – MWh and MWDSM Market Potential Assessment4–11

### Xcel Energy Colorado March 12, 2010 

### Figure 4-7 Commercial Electricity Usage by Building Type Energy Peak Demand

0 2,000,000 4,000,000 6,000,000 Other Lodging

Health College School Warehouse Grocery Restaurant Retail Office

MWh 0 500 1000 1500 Other Lodging

Health College School Warehouse Grocery Restaurant Retail Office

M W 

### Figure 4-8 Commercial Electricity Usage by End Use Energy Peak Demand

0 2,000,000 4,000,000 6,000,000 Misc Heating Cooking Data Centers Office Equipment Refrigeration

Ventilation

Cooling Lighting

MWh 0 500 1,000 1,500 Misc Heating Cooking Data Centers Office Equipment Refrigeration

Ventilation

Cooling Lighting

MW



### DSM Market Potential Assessment 4–12

### Xcel Energy Colorado March 12, 2010 

## 4.2.3 Industrial Data on the industrial sector consisted of Xcel Energy ’s billing data and end-use consumption data at the national level, developed as part of the U.S. DOE Manufacturing Energy Consumption Survey (MECS). The motors end-use data were further disaggregated using national-level data developed by KEMA as part of a U.S. Motors Assessment Study conducted for the DOE in 1998. Given the relatively small size of the Xcel Energy industrial sector relative to its residential and commercial sectors, it was determined that aggregate national-level data were sufficien t for the industrial baseline work. Similar to the residential and commercial sectors, industrial peak-dem and estimates were calibrated to ensure that they were consistent with Xcel Energy’s system peak demand. Figure 4-9 summarizes industrial electricity consump tion and peak demand by industry type. The electronics industry accounts for the largest share of ener gy use, followed by the primary metals industry. Electronics, primary metals, food, mining, and fabr icated metals all account for significant shares of industrial peak demand. Figure 4-9 Industrial Electricity Usage by Industry Type Energy Peak Demand

0 200 400 600 800 WWT Mining

Misc Transp Equip

Electronics Ind Machinery

Fab Metals Primary Metals Stone-clay-glass Plastics Petroleum Chemicals

Printing

Paper Lumber Textiles

Food

GWh 0 50 100 150 WWT Mining

Misc Transp Equip

Electronics Ind Machinery

Fab Metals Primary Metals Stone-clay-glass Plastics Petroleum Chemicals

Printing

Paper Lumber Textiles

Food

MW



### DSM Market Potential Assessment 4–13

### Xcel Energy Colorado March 12, 2010 

### Figure 4-10 shows electricity consumption and peak demand estimates by industrial end use. Process drives account for the largest single share of energy consumption, followed by pumping systems, HVAC, and process heating. HVAC and process drives contri bute most to peak demand, followed by process cooling. Figure 4-10 Industrial Electricity Usage by End Use Energy Peak Demand

0 200 400 600 800 Proc Heat Proc Cool

Pumps

Fans Comp Air Proc Drives Proc Other HVAC Lighting

Other Boiler Use CHP Proc

GWh 0 20 40 60 80 100 120 Proc Heat Proc Cool

Pumps

Fans Comp Air Proc Drives Proc Other HVAC Lighting

Other Boiler Use CHP Proc

MW 

# 4.3 Natural Gas 4.3.1 Residential As with electricity, we broke the residential sect or into five segments for the natural-gas study:

• 

### Single family–large

• 

### Single family–medium

• 

### Single family–small

• 

### Multifamily

• 

### Low income

DSM Market Potential Assessment 4–14

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 4–15 

### For single-family homes, the large and small segment s are designed to comprise 20 percent of the singlefamily homes category each, and the medium segment comprises 60 percent of the single-family homes. The saturation analysis to derive percentage of hom es that have a given end use was conducted using the most recent Xcel Energy Home Use Study. UECs (energy use per applian ce) were developed using secondary source data. Household estimates for each segment were based on analysis of the Home Use Study. Table 4-5 summarizes the residential baseline natural-gas consumption results developed for the study. Figure 4-11 shows the breakdown of natural-gas use by residential segment. Figure 4-12 breaks down natural-gas use by end use. Overall consumption of natural-g as and peak-day use is shown in Figure 4-13 by customer segment. Although the small single-family and large single-fa mily segments represent the same number of homes, the natural-gas use for the large single-family segment is more than three times that of small single-family homes. Figure 4-14 shows energy use and peak-day use for natu ral gas by end use. Natural-gas usage is dominated by furnace use at about 50,000 Dth, follow ed by water heating and boiler use. Furnaces are the largest contributors to peak-day gas use, followed by boilers.Xcel Energy ColoradoMarch 12, 2010Table 4-5Residential Baseline Consumption Summary – Natural Gas - ThermsEnd UseSaturation UEC Avg Use Saturation UEC Avg Use Saturation UEC Avg Use Saturation UEC Avg Use Saturation UEC Avg UseFurnace0.70 1,027716 0.81 608492 0.85 310262 0.51 527267 0.68 536364Boiler0.14 1,258177 0.12 73485 0.02 3686 0.11 64670 0.15 64894Room Heat0.02 97322 0.00 5750 0.04 27010 0.07 43430 0.05 50825Water Heating0.95 345330 0.90 234211 0.90 134120 0.77 257199 1.00 206205Clothes Drying0.20 5611 0.07 443 0.08 373 0.10 354 0.05 442Cooking0.33 92 30 0.30 82 25 0.32 79 25 0.19 74 14 0.23 82 19Other0.05 29514 0.04 1858 0.02 1403 0.02 1403 0.07 18512Use Per Home1,300823429586722Homes186,244558,732186,244201,71670,374Total Use242,097,338460,073,05279,965,483118,193,90750,819,794Low IncomeSingle Family LargeSingle Family MediumSingle Family SmallMultifamilySource: Xcel Energy Billing Data-2008, Xcel Energy Home Use Data-2008, KEMA Analysis, Calibrated to 2010 Sales Forecast (fromFeb./Mar. 2009)DSM Market Potential Assessment4–16

### Xcel Energy Colorado March 12, 2010 

### Figure 4-11 Residential Natural-Gas Shares by Segment, 2010

Single Family Large 24% Single Family Medium

43% Single Family Small

7% Multifamily 10% Low Income

16%

Source: Xcel Energy Billi ng Data-2008, Xcel Energy Home Use Data-2008, KEMA Analysis 

### Figure 4-12 Residential Natural-Gas Shares by End Use, 2010

Furnace

50% Boiler 13% Room Heat 4% Water Heating

28%

Cooking

3% Other

2% Clothes Drying 0.3%

Source: Xcel Energy Billi ng Data-2008, Xcel Energy Home Use Data-2008, KEMA Analysis



### DSM Market Potential Assessment 4–17

### Xcel Energy Colorado March 12, 2010 

### Figure 4-13 Residential Natural-Gas Usage by Customer Segment Energy Peak Demand

0 15,000 30,000 45,000 Single Family Large Single Family Medium

Single Family Small Multifamily Low Income

Dth (thousands) 

### 0 100 200 300 400 500 Single Family Large Single Family Medium

Single Family Small Multifamily Low Income

Dth/day (thousands)



### Figure 4-14 Residential Natural-Gas Use by End Use Energy Peak Demand

0 20,000 40,000 60,000 Other Cooking Clothes Drying Water Heating Room Heat Boiler Furnace

Dth (thousands) 0 200 400 600 800 Other Cooking Clothes Drying Water Heating Room Heat Boiler Furnace

Dth/day (thousands)



### DSM Market Potential Assessment 4–18

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 4–19 

## 4.3.2 Commercial The primary sources of commercial data for the Xcel Energy Colorado service area were the U.S. DOE Commercial Building Energy Consumption Survey (CBECS) and Xcel Energy’s billed consumption data. CBECS data for the Mountain Region were used to develop end-use satur ation and EUI (Energy Utilization Indices in therms per square foot ) data as well as whole-building EUI estimates. For the commercial sector, no estimates of consuming units (square feet of commercial space by building type) were available for the Xcel Energy Colorado te rritory. Square footage estimates were developed for each key building type by dividing Xcel Energy’s energy consumption (kWh) by whole-building EUIs (kWh per square foot). Load-shape data from Xcel Energy were utilized to allocate annual en ergy usage to Xcel Energy’s timeof-use (TOU) periods. Peak-period usage, devel oped on a sector-specific and end-use basis, was calibrated to equal the Xcel Energy summer peak. Table 4-6 summarizes the commercial baseline natural-gas consumption results developed for the study. Figure 4-15 shows commercial natural-gas consumption a nd peak-day use by building type. The office and miscellaneous building types account for the largest shares of both energy and peak-day usage. Figure 4-16 shows commercial natural-gas consumpti on and peak-day use by end use. Heating contributes most to energy consumption at more th an 20 million Dth per year, followed by water heating at about 7 million Dth per year. For peak-day use, h eating is by far the largest contributor at about 340,000 Dth per day. Water heating has the next largest impact, at only 20,000 Dth per day.Xcel Energy ColoradoMarch 12, 2010Table 4-6Commercial Baseline Natural-Gas Consumption SummarySaturationOffice Retail Restaurant Grocery Warehouse School College Health Lodging OtherHeating0.95 0.84 0.31 0.99 0.77 0.89 0.98 0.62 0.80 0.94Water Heating - high standby0.83 0.55 0.52 0.78 0.89 0.82 0.91 0.95 1.00 0.84Water Heating - low standby0.00 0.00 0.52 0.00 0.00 0.82 0.91 0.95 1.00 0.00Fryer0.04 0.10 0.71 0.00 0.06 0.24 0.01 0.39 0.52 0.15Steamer0.04 0.00 0.52 0.00 0.00 0.53 0.01 0.39 0.06 0.12Convection Oven0.04 0.09 0.66 0.32 0.12 0.56 0.01 0.35 0.52 0.17Griddle0.08 0.01 0.65 0.13 0.23 0.60 0.01 0.35 0.52 0.17Range0.09 0.10 0.76 0.32 0.23 0.51 0.01 0.33 0.54 0.20Other0.00 0.00 0.13 0.00 0.00 0.09 0.33 0.08 0.03 0.01EUI (kBtu/End-use ft2)Office Retail Restaurant Grocery Warehouse School College Health Lodging OtherHeating78.0 18.8 18.8 13.1 16.5 32.8 10.82.8 15.0 44.0Water Heating - high standby8.94.8 21.9 20.42.10.00.00.00.0 31.5Water Heating - low standby0.00.0 27.50.00.0 10.0 12.1 27.0 24.40.0Fryer1.66.1 24.8 14.71.91.11.63.15.32.6Steamer0.93.6 14.58.61.10.70.91.83.11.5Convection Oven0.20.93.72.20.30.20.20.50.80.4Griddle0.62.49.95.90.80.50.61.32.11.1Range0.83.1 12.67.51.00.60.81.62.71.3Other0.00.0 14.90.00.0 11.89.80.00.0 858.5Office Retail Restaurant Grocery Warehouse School College Health Lodging Other TotalSquare Feet (1000s)166,188 121,981 29,671 16,864 129,268 30,254 28,860 34,172 26,077 89,124 672,460Heating12,340,476 1,920,287 174,970 218,848 1,647,324 883,092 305,791 59,656 312,224 3,674,850 21,537,518Water Heating - high standby1,236,327 316,572 340,055 268,087 236,5710000 2,347,910 4,745,523Water Heating - low standby00 426,82100 248,172 318,484 874,380 637,2210 2,505,078Fryer11,266 70,505 521,7740 14,354 8,188 308 41,505 72,447 35,262 775,609Steamer6,5740 224,37700 10,656 180 24,218 5,057 17,130 288,192Convection Oven1,765 9,666 73,381 11,854 4,396 2,87647 5,612 10,888 6,209 126,694Griddle8,391 2,556 190,944 13,274 23,054 8,228 123 14,828 28,766 16,403 306,567Range11,825 35,772 282,233 40,390 29,355 8,914 157 18,010 37,953 23,882 488,490Other00 56,76800 33,157 93,62900 443,899 627,452Total13,616,625 2,355,359 2,291,321 552,453 1,955,054 1,203,283 718,718 1,038,209 1,104,557 6,565,544 31,401,123Dth by End UseDSM Market Potential Assessment4–20

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 4-21 

### Figure 4-15 Commercial Natural-Gas Usage by Building Type Energy Peak-Day Use

0 4,000 8,000 12,000 16,000 Other Lodging

Health College School Warehouse Grocery Restaurant Retail Office

Dth (thousands) 0 50 100 150 200 250 Other Lodging

Health College School Warehouse Grocery Restaurant Retail Office

Dth/day (thousands)



### Figure 4-16 Commercial Natural-Gas Usage by End Use Energy Peak-Day Use

0 5,000 10,000 15,000 20,000 25,000 Heating Water Heating Cooking

Other

Dth (thousands) 0 50 100 150 200 250 300 350 Heating Water Heating Cooking

Other

Dth/day (thousands)

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 4-22 

## 4.3.3 Industrial Data for the industrial sector consisted of Xcel Energy ’s billing data and end-use consumption data at the national level developed as part of the U.S. DOE Manufacturing Energy Consumption Survey (MECS). The motors end-use data were further disaggregated using national-level data developed by KEMA as part of a U.S. Motors Assessment Study conducted for the DOE in 1998. Given the relatively small size of the Xcel Energy industrial sector relative to the residential and commercial sectors, it was determined that aggregate national-level data were sufficien t for the industrial baseline work. Similar to the residential and commercial sectors, industrial peak-dem and estimates were calibrated to ensure that they were consistent with Xcel Energy’s system peak demand. Figure 4-17 summarizes industrial natural-gas consumption and peak-day use by industry type. The electronics industry accounts for the largest share of industrial natural-gas use, followed by the food and fabricated-metals industry. Electronics contributes th e most to industrial peak-day use, followed by fabricated metals and printing. Figure 4-17 Industrial Natural-Gas Usage by Industry Type Energy Peak-Day Use

0 100 200 300 400 500 Misc Transp Equip

Electronics Ind Machinery

Fab Metals Primary Metals Stone-clay-glass Plastics Petroleum Chemicals Printing

Paper Lumber Textiles

Food

Dth (Thousands) 01234 Misc Transp Equip

Electronics Ind Machinery

Fab Metals Primary Metals Stone-clay-glass Plastics Petroleum Chemicals Printing

Paper Lumber Textiles

Food

Dth/day (Thousands)

### Xcel Energy Colorado March 12, 2010 

### Figure 4-18 shows natural-gas consumption and peak-day use estimates by industrial end use. Process heat accounts for the largest single share of natura l-gas consumption, followed by boiler systems and HVAC. HVAC is the largest contributor to peak-d ay use, followed by process heat and boilers. Figure 4-18 Industrial Natural Gas Usage by End Use Energy Peak-Day Use

0 500 1,000 1,500 Proc Heat HVAC Boiler Use CHP Other

Dth (Thousands) 0 2 4 6 8 10 Proc Heat HVAC Boiler Use CHP Other

Dth/day (Thousands)



### DSM Market Potential Assessment 4-23

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-1 

# 5. Electric Energy-Efficiency Potential Results In this section, we present estimates of electric energy-e fficiency potential. First, we present technical and economic potential results for all electric measures cons idered in the study. Next, we present estimates of achievable program potential under different program funding scenarios. The base results exclude impacts from behavioral-conservation programs a nd from emerging technologies. These additional elements are discussed separately, since these measures do not have the track record of more proven energy-efficiency technologies, and their impacts are more uncertain. 

# 5.1 Technical and Economic Potential Estimates of overall energy-efficiency technical and economic potential are discussed in section 5.1.1

. More detail on these potentials is presented in section 5.1.2 . Energy-efficiency supply curves are shown in section 5.1.3

. 

## 5.1.1 Overall Technical and Economic Potential Figure 5-1 presents our overall estimates of total techni cal and economic potential for electrical energy and peak-demand savings for the Xcel Energy Colorado service territory. Technical potential represents the sum of all savings from all of the measures deemed applicable and technically feasible. Economic potential is based on efficiency measures that are cost-eff ective, which is based on the total resource cost (TRC) test

― a benefit-cost test that compares the value of avoided energy production and power-plant construction to the costs of energy-efficiency meas ures and program activities necessary to deliver them. The values of both energy savings and peak-demand reductions are incorporated in the TRC test. Energy Savings. Technical potential is estimated at about 8,938 GWh per year, and economic potential at 7,563 GWh per year by 2020 (about 27 and 23 percent of base 2020 usage, respectively). Peak-Demand Savings . Technical potential is estimated at about 2,161 MW, and economic potential at 1,730 MW by 2020 (about 33 and 26 percent of base 2020 demand, respectively). Note that the technical and economic potentials incl ude the effect of CFLs, although federal lighting standards may preclude much of the CFL potential in Xcel Energy programs. Overall, CFLs account for about 1,200 GWh of energy-savings potential (16 per cent of total economic energy savings potential) and 150 MW of peak-demand potential (8 percent of to tal economic peak-demand potential) in 2020.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-2 

### Figure 5-1 Estimated Electric Technical and Economic Potential, 2020 Xcel Energy Colorado Service Territory

8,938 GWh

2,161 MW 7,563 GWh

1,730 MW

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

Energy Savings Potential Peak Demand Potential Technical Economic



## 5.1.2 Technical and Economic Potential Detail In this subsection, we explore technical and economic potential in more detail, looking at potentials by sector and by end use. 5.1.2.1 Potentials by Sector Figure 5-2 and Figure 5-3 show estimates of technical- and economic-energy and demand savings potential by sector. Figure 5-4 and Figure 5-5 show the same potentials as a percentage of 2020 base energy and base peak demand. The commercial sector provides the largest contribution to both technical and economic potential for energy savings, accounting for about 55 percent of these potentials. The commercial sector also contributes the most to the technical and economic potential for peak-demand savings, accounting for about 45 percent of these potentials. The residential sector accounts for a similar share of economic peakdemand potential. As shown in Figure 5-4 and Figure 5-5 , the residential sector has a somewhat higher savings potential in relation to base energy use than does the commercial or industrial sectors. The estimated savings fraction

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-3 

### is lowest for the industrial sector at around 12 percent, which is lower than the 14 to 22 percent of costeffective industrial savings estimated by the National Academy of Sciences 5 

### , but is in line with industrial savings fractions estimated by EPRI 6



### .

Figure 5-2 Technical and Economic Potential (2020) Energy Savings by Sector—GWh per Year Figure 5-3 Technical and Economic Potential (2020) Demand Savings by Sector—MW

3,373 4,923

643 2,813 4,145

605

0 1,000 2,000 3,000 4,000 5,000 6,000

Residential Commercial IndustrialCumulative Annual Savings by 2020 - GWh Technical Economic 949 1,119

93 818 826

86 0 200 400 600 800 1,000 1,200

Residential Commercial IndustrialCumulative Savings by 2020 - MW Technical Economic

5 

### Real Prospects for Energy Efficiency in the United States , America’s Energy Futu re Energy Efficiency Subcommittee, Nation Academy of Sciences, National Acad emy of Engineering, Nationa l Research Council, 2009. 6 

### Assessment of Achievable Potential from Energy E fficiency and Demand Response Programs in the U.S. , EPRI, 2009.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-4 

### Figure 5-4 Technical and Economic Potential (2020) Percentage of Base Energy Use Figure 5-5 Technical and Economic Potential (2020) Percentage of Base Peak Demand

34%
28%

12% 28% 24%

12%

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50%

Residential Commercial IndustrialPercent of Forecast Energy Use Technical Economic 38%
33%

13% 33%

24%

12%

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50%

Residential Commercial IndustrialPercent of Forecast Peak Demand Technical Economic



### 5.1.2.2 Potentials by Building Type Figure 5-6 and Figure 5-7 show the potentials in the residential sector by building type. Single-family homes account for about two-thirds of the potential, and low-income homes account for about 15 percent of the potential. Figure 5-6

Residential Energy-Savings Potential by Building Type (2020) Figure 5-7 Residential Demand-Savings Potential by Building Type (2020)

2,223

624

526 1,879

488

446
0 500 1,000 1,500 2,000 2,500 Single Family

Multifamily

Low Income

Cumulative Annual GWh Technical Econonomic 635

178

135 547

153

118

0 100 200 300 400 500 600 700 Single Family

Multifamily

Low Income

Cumulative Peak MW Technical Econonomic

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-5 

### Figure 5-8 and Figure 5-9 show the building-type breakdown of commercial potential. Offices account for almost 40 percent of the economic potential, follo wed by retail, warehouses, and other commercial buildings. Figure 5-8 Commercial Economic Energy-Savings Potential by Building Type (2014) Figure 5-9 Commercial Economic Demand-Savings Potential by Building Type (2014)

1,874

478

297

233

428

223

195

294

171

729 1,600

416

252

215

325

169

171

245

152

600 0 500 1,000 1,500 2,000 Office
Retail
Restaurant

Grocery
Warehouse
School College
Health Lodging

Other

Cumulative Annual GWh Technical Econonomic 420

116

78

35

118

41

44

53

38

176 310

86

59

30

78

29

36

41

30

128 0 100 200 300 400 500 Office
Retail
Restaurant

Grocery
Warehouse
School College
Health Lodging

Other

Cumulative Peak MW Technical Econonomic



### Figure 5-10 and Figure 5-11 show the business-type breakdown of i ndustrial potential. Key industries in terms of economic potential include electronics, food processing, and petroleum refining. The electronics industry contributes a relatively higher amount to p eak demand as the result of having more HVAC loads.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-6 

### Figure 5-10 Industrial Economic Energy-Savings

Potential by Business Type (2020) Figure 5-11 Industrial Economic Demand-Savings

Potential by Business Type (2020)

77
3
17

9
35
20
85
20
46
56
52
20
95
8
8
54
35 75
3
16

8
31
19
83
20
43
54
49
19
87
7
7
49
34 0 20 40 60 80 100 Food Textiles-Apparel Lumber-Furniture Paper Printing Chemicals Petroleum Rubber-Plastics Stone-Clay-Glass Prim Metals Fab Metals

Ind Mach Electronics Transp Equip Misc Ind

Mining Water/WW

Cumulative Annual GWh Technical Econonomic 11
2
3
1
6
3
10

3
6
9
8
5
14
1
1
6
4 11
2
3
1
5
2
10

3
5
8
8
5
13
1
1
6
4 0 2 4 6 8 10 12 14 16 Food Textiles-Apparel Lumber-Furniture Paper Printing Chemicals Petroleum Rubber-Plastics Stone-Clay-Glass Prim Metals Fab Metals

Ind Mach Electronics Transp Equip Misc Ind

Mining Water/WW

Cumulative Peak MW Technical Econonomic



### 5.1.2.3 Potentials by End Use Figure 5-12 and Figure 5-13 show the end-use breakdown of tec hnical and economic potential in the residential sector. Energy savings potential is split fairly evenly among the lighting and cooling end uses, followed by refrigeration and plug loads (including entertainment and computers). Cooling accounts for most of the peak-demand savings potential, since ve ry little lighting is used on warm summer afternoons. Whole-building new construction measures also accountfor significant amounts of both energy and peakdemand potential.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-7 

### Figure 5-12 Residential Economic Energy-Savings Potential by End Use (2020) Figure 5-13 Residential Economic Demand-Savings Potential by End Use (2020)

820
165
166
765
344
169
85
213
42
119
485 636
165
75
733
306
46
53
213
42

76
470 0 200 400 600 800 1,000 Cooling
Furnace/AC Fan Heating Lighting Refrigeration Water Heating

Plug Loads
Entertainment

Computers
Miscellaneous Whole Bldg (New Constr)

Cumulative Annual GWh Technical Econonomic 587
45
0
71
52
18
10
27

5
16
119 490

45
0
68

46
5
6
27
5
11
115 0 100 200 300 400 500 600 700 Cooling
Furnace/AC Fan Heating Lighting Refrigeration Water Heating

Plug Loads
Entertainment

Computers
Miscellaneous Whole Bldg (New Constr)

Cumulative Peak MW Technical Econonomic



### Figure 5-14 and Figure 5-15 show the end-use breakdown of commercial potential. Lighting’s end use is the largest contributor to both energy and peak-d emand economic-savings potential. CFLs and premium T8 lamps with electronic ballasts are key lighting measures.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-8 

### Figure 5-14 Commercial Economic Energy Savings Potential by End Use (2014) Figure 5-15 Commercial Economic Demand Savings Potential by End Use (2014)

2,121
196
609

332
144
217
210
79
50
36
930 1,768

185
425
108
142
216
210
78
49
34
930 0 500 1,000 1,500 2,000 2,500 Indoor Lighting Outdoor Lighting Cooling
Ventilation Refrigeration Office Equipment
Data Center/Server Water Heating Vending Machines Cooking Whole Bldg (New Constr)

Cumulative Annual GWh Technical Econonomic 348
5
395
111
15
21
28
10
5
5
175 278
5
263
21
15
21
28
10
5
5
175 0 100 200 300 400 500 Indoor Lighting Outdoor Lighting Cooling
Ventilation Refrigeration Office Equipment Data Center/Server Water Heating Vending Machines Cooking Whole Bldg (New Constr)

Cumulative Peak MW Technical Econonomic



### Figure 5-16 and Figure 5-17 show the end-use breakdown of industrial potential. Pumping-system measures provide the largest source of economic potential, followed by compressed-air systems and lighting. Figure 5-16 Industrial Economic Energy-Savings Potential by End Use (2020) Figure 5-17 Industrial Economic Demand-Savings Potential by End Use (2020)

108
64
225
44
20
9
64
103
6 105
62
221
44
20
9
38
101
6 0 50 100 150 200 250 Compressed Air
Fans Pumps
Drives Heating Refrigeration Cooling Lighting

Other

Cumulative Annual GWh Technical Econonomic 15
7
29
7
3
2
13
16
1 14
7
28
7
3
2
8
16
1 0 5 10 15 20 25 30 35 Compressed Air
Fans Pumps
Drives Heating Refrigeration Cooling Lighting

Other

Cumulative Peak MW Technical Econonomic

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-9 

## 5.1.3 Energy-Efficiency Supply CurvesA common way to illustrate the amount of energy savings per dollar spent is to construct an energyefficiency supply curve. A supply curve typically is depicted on two axes: one captures the cost per unit of saved energy (e.g., levelized $/kWh saved), and th e other shows energy savings at each level of cost. Measures are sorted on a least-cost basis, and total savings are calculated incrementally with respect to measures that precede them. The costs of the measures ar e levelized over the life of the savings achieved. Figure 5-18 and Figure 5-19 present the supply curves constructed for this study for electric energyefficiency and peak-demand efficien cy, respectively. Each curve repr esents savings as a percentage of total energy or peak demand. These cu rves show that energy savings of about 16 percent are available at under $0.05 per kWh, and peak demand savings of ab out 9 percent are available at under $100 per MW. Savings potentials and levelized costs for the indivi dual measures that comprise the supply curves are provided in Appendix G. Figure 5-18 Electric Energy Supply Curve*

$0.00 $0.05 $0.10 $0.15 $0.20 $0.25 $0.30 $0.35 $0.40 $0.45 $0.50

0% 5% 10% 15% 20% 25% 30% Savings Potential as a Percent of Total Energy SalesLevelized $/kWh Saved

*Levelized cost per kWh saved is calculated using a 7.9 percent nominal discount rate.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-10 

### Figure 5-19 Peak-Demand Supply Curve*

$0 $100 $200 $300 $400 $500 $600 $700 $800 $900 $1,000

0.0% 5.0% 10.0% 15.0% 20.0% 25.0% 30.0% 35.0% Savings Potential as a Percent of Total Peak DemandLevelized $/kW Saved

*Levelized cost per kW saved is calculated using a 7.9 percent nominal discount rate. 

# 5.2 Achievable (Program) Potential In contrast to technical and economic potential estim ates, achievable potential estimates take into account market and other factors that affect the adoption of efficiency measures. Our method of estimating measure adoption takes into account market barriers and reflects actual consumer- and business-implicit discount rates. This section presents results for achievable potential, first at the summary level and then by sector. More detail on achievable progr am potential is shown in Appendix H. Achievable potential refers to the amount of savings that would occur in response to one or more specific program interventions. Net savings associated with program poten tial are savings that are projected beyond those that would occur naturally in the absen ce of any market intervention. Because achievable potential depends on the type and degree of interven tion applied, we develope d potential estimates under alternative funding scenarios: 50-percent incentives, 75-percent incentives, a nd 100-percent incentives. These scenarios reflect the percentage of incremental me asure cost that is assumed to be paid in customer incentives. (The low-income market segment was modeled using 100-percent incentives for each scenario, but the level of program effort increased acr oss scenarios in line with increases in other market segments.) We estimated program energy and peak-demand savings under each scenario for the 2010-2020 period.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-11 

### Figure 5-20 and Figure 5-21 show our estimates of achievable poten tial savings over time. As shown in Figure 5-20 , by 2020, cumulative net 7 

### energy savings are projected to be 1,802 GWh under the 50- percent incentive scenario, 2,806 GWh under the 75-pe rcent incentive scenario, and 4,892 GWh under th 100-percent incentive scenario. e

incentives.
Achievable Electric Energy-Savings: All Sectors Figure 5-21 depicts projected net peak-demand savings of 328 MW under 50-percent incentives, 538 MW under 75-percent incentives, and 1,198 MW under 100-percent
Figure 5-20

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual GWh Naturally Occurring 100% Incentive 75% Incentive 50% Incentive

Prog Cost to 2020: $2,725 Mil

Prog Cost to 2020: $957 Mil

Prog Cost to 2020: $474Mil

7 

### Throughout this section, net refers to savings beyond those estimated to be naturally occurring; that is, from customer adoptions that would occur in the absence of any programs or standards.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-12 

### Figure 5-21 Achievable Peak-Demand Savings: All Sectors

0 200 400 600 800 1,000 1,200 1,400 1,600

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Peak MW Naturally Occurring 100% Incentive 75% Incentive 50% Incentive

Prog Cost to 2020: $2,725 Mil

Prog Cost to 2020: $957 Mil

Prog Cost to 2020: $474 Mil



### Figure 5-22 depicts costs and benefits under each fundi ng scenario from 2010 to 2020. The present value of program costs (including administration, marketing, and incentives) is $354 million under the 50- percent incentive scenario, $719 million under the 75-percent incentive scenario, and $2,130 million under the 100-percent incentive scen ario. The present value of total avoided-cost benefits is $2,095 million under 50-percent incentives, $3,337 million under 75-percent incentives, and $6,496 million under 100-percent incentives. The present value of net avoided-cost benefits, i.e., the difference between total avoided-cost benefits and total costs (which incl ude participant costs in addition to program costs), is $1,575 million under 50-percent incentives, $2,448 million under 75-percent incentives, and $4,166 million under 100-percent incentives.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-13 

### Figure 5-22 Benefits and Costs of Energy-Efficiency Savings—2010-2020*

$573 $278 $184 $1,557
$441 $170 $201

$169 $166 $6,496

$3,337

$2,095

$0 $1,000 $2,000 $3,000 $4,000 $5,000 $6,000 $7,000Present Value in $ Millions Total Avoided Cost Benefits Participant Costs Program Incentives Program Admin and Marketing

50% Incentive 100% Incentive Net Benefits: $1,575 Million Net Benefits: $4,166 Million

75% Incentive Net Benefits: $2,448 Million

* Present value of benefits and costs over normalized 20-year measure lives; nominal disc ount rate is 7.9 percent, inflation rate is 1.5 percent. 

### All three of the funding scenarios are cost-effective based on the TRC test, which is the test used in this study to determine program cost-effectiveness. The TRC benefit-cost ratios are 4.06 for the 50-percent incentive scenario, 3.8 for the 75-percent incentiv e scenario, and 2.8 for the 100-percent incentive scenario. This indicates that program cost-effectiveness declines somewhat with increasing program effort, reflecting penetration of more measures with lower cost-effectiveness levels. Key results of our efficiency scenario forecasts from 2010 to 2020 are summarized in Table 5-1

.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-14 

### Table 5-1 Summary of Achievable Potential Results—2010-2020 Program Scenario Result 50% Incentive 75% Incentive 100% Incentive Gross Energy Savings - GWh 2,946 3,949 6,036 Gross Peak Demand Savings - MW 486 696 1,356 Net Energy Savings - GWh 1,802 2,806 4,892 Net Peak Demand Savings - MW 328 538 1,198 Program Costs - Real, $ Million Administration $179 $303 $682 Marketing $69 $70 $77 Incentives $227 $584 $1,966 Total $474 $957 $2,725 PV Avoided Costs Benefits $2,095 $3,337 $6,496 PV Annual Marketing and Admin Costs $184 $278 $573 PV Net Measure Costs $336 $611 $1,757 TRC Ratio 4.0 3.8 2.8

PV (present value) of benefits and costs is calcul ated over a 20-year normalized measure life for 2010- 2020 program years, nominal discount rate = 7.9 pe rcent, inflation rate = 1.5 percent; GWh and MW savings are cumulative through 2020. 

## 5.2.1 CFL Potentials and Federal Lighting Standards Federal lighting standards that are being introduced in 2012 and continue ti ghtening through 2020 will reduce the allowed minimum energy consumption fo r incandescent bulbs. This, in turn, will lower impacts of program CFLs. While it is not entirely cl ear how markets will respond to the new standards, it appears that CFL impacts will be reduced in two ways: (1) CFL savings over a base incandescent bulb will be lower as the base incandescent usage drops; and (2) the more efficient incandescent bulbs will likely cost more, and this effect will increase a natura lly occurring shift to CFLs due to price effects. Figure 5-23 illustrates how the impacts of program CFLs are reduced over time in response to the federal standards. Overall, we expect some reduction in impacts between 2012 and 2014 and further reduction in CFL impacts after 2020. In addition to the effects of standards, continued penetration of CFLs into the market will also put a dampening effect on future program CFL impacts, as the measure reaches high saturation levels and it becomes more difficult to find customers who have not converted most of their lighting to CFLs.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-15 

### Figure 5-23 Incremental Impacts of Program CFLs versus Other Measures – 75% Incentive Case

0 50 100 150 200 250 300 350

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Incremental Program Impacts - Annual GWh Other Measures CFLs



## 5.2.2 Breakdown of Achievable Potential Cumulative net achievable potential estimates by customer class for the period of 2010-2020 are presented in Figure 5-24 and Figure 5-25 . These figures show results for each funding scenario. Under the program assumptions developed for this study, achie vable energy savings are highest for the commercial sector, while peak-demand savings are highest for the commercial sector in the 50-percent and 75-percent incentive scenarios and are higher for the reside ntial sector in the 100-percent incentive scenario.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-16 

### Figure 5-24 Net Achievable Energy Savings (2020) by Sector—GWh per Year Figure 5-25 Net Achievable Peak-Demand Savings (2020) by Sector—MW

2,045 2,473

374 866 1,654

285 565 1,054

184 0 500 1,000 1,500 2,000 2,500 3,000

Residential Commercial IndustrialCumulative Annual Savings by 2020 - GWh 100% Incentive 75% Incentive 50% Incentive 620
527

52 189 310

39 112 191

24 0 100 200 300 400 500 600 700

Residential Commercial IndustrialCumulative Savings by 2020 - MW 100% Incentive 75% Incentive 50% Incentive



### 5.2.2.1 Residential Sector Figure 5-26 and Figure 5-27 show cumulative net achievable progr am savings by residential program scenario. By 2020, net energy savings reach 565 GW h under the 50-percent incentive scenario, 189 GWh under the 75-percent incentive scenario, and 620 GWh under the 100-percent incentive scenario. Energy savings are most sensitive to changes in incentives in the 75- to 100-pe rcent range. For peak demand, net savings increase from 112 MW under 50-percent incentiv es to 189 MW under 75-percent incentives to 620 MW under 100-percent incentives.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-17 

### Figure 5-26 Achievable Energy Savings: Residential Sector

0 500 1,000 1,500 2,000 2,500

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual GWh Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 5-27 Achievable Peak-Demand Savings: Residential Sector

0 100 200 300 400 500 600 700

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative MW Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 5-28 and Figure 5-29 show the end-use distribution of energy and peak-demand savings, cumulative to 2020. Key end uses for energy-savings potential include lighting, cooling, refrigeration,

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-18 

### Energy Star entertainment systems, and new cons truction measures. Cooling and new construction measures provide much of the peak-demand savings potential. The figures also show that our models predict a large increase in savings when incentives are increased fro m 75 percent to 100 percent of incremental measure cost. This is especially true for the replace-on-burnout measures where customers are much more likely to choose energy-efficient equipment at the time of replacement if there is no cost premium over standard-efficiency equipment. Figure 5-28 Residential Net Energy-Savings Potential by End Use (2020) Figure 5-29 Residential Net Peak-Savings Potential by End Use (2020)

505

155

54

496

202

32

27

106

20

56

395 107

41

25

314

71

19

16

88

17

28

140

47

15

12

187

34

9

16

86

17

15

128 0 100 200 300 400 500 600 Cooling

Furnace/AC Fan
Heating
Lighting
Refrigeration
Water Heating
Plug Loads

Entertainment

Computers

Miscellaneous Whole Bldg (New Constr)

Cumulative Annual GWh 100% Incentives 75% Incentives 50% Incentives 374

42

0

46

30

3

3

14

2

8

97 83

11

0

29

11

2

2

11

2

4

34 37

4

0

17

5

1

2

11

2

2

31 0 100 200 300 400 Cooling

Furnace/AC Fan
Heating
Lighting
Refrigeration
Water Heating
Plug Loads

Entertainment

Computers

Miscellaneous Whole Bldg (New Constr)

Cumulative Peak MW 100% Incentives 75% Incentives 50% Incentives



### Table 5-2 shows how the low-income potentials compare to the overall residential potentials. The lowincome segment accounts for about 13 percent of total residential economic potential and about 10 percent of total residential achievable potential. The primary reason for drop-off in low-income achievable potential relative to total residential potenti al is the exclusion of CFLs from the low-income totals. Note that the low-income segment was not mo deled using varying incentive levels. Rather, this segment was assumed to receive incentives equal to 10 0 percent of incremental measure cost for all

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-19 

### program scenarios, and the level of program effort wa s adjusted to allow for th e low-income potentials to track other residential segments in terms of program achievements. Table 5-2 Low-Income Potentials Compared to Total Residential Potentials (2020) Program Scenario Economic Potential 100% Incentive 75% Incentive 50% Incentive Residential 2,813 2,045 866 565 Low Income 366 185 92 55 % of Residential 13% 9% 11% 10% Note: Low-income economic potentials incl ude CFLs, but the low-income achievable potentials exclude CFLs. 

### Table 5-3 lists the various potentials for residential m easures that passed cost-e ffectiveness screening. The list is sorted by economic potential.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-20 

### Table 5-3 Measure-Specific Residential Results (Cumulative to 2020) – GWh

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econ Ach @75% Incentives % of Net Econ Ach @50% Incentives % of Net Econ CFL 13W 35.4 477.6 477.6 259.6 255.7 99% 226.9 87% 164.1 63% CFL 13W - Specialty 2.7 245.5 245.5 243.8 239.9 98% 86.8 36% 22.6 9% WINDOWS - Default With Sunscreen 3.2 198.1 197.3 197.3 183.4 93% 21.2 11% 11.4 6% ECM Furnace Fan (variable speed motor) 5.4 164.5 164.5 164.1 154.8 94% 41.3 25% 15.1 9% Refrigerator (Energy Star) 2.2 152.8 152.8 151.7 62.7 41% 25.6 17% 15.9 11% Evaporative Cooler - Direct 1.6 132.2 126.0 125.1 118.3 95% 34.5 28% 13.5 11% Refrigerator - Early Replacement (Energy Star) 1.9 115.2 115.2 114.9 108.7 95% 36.2 32% 13.7 12% Energy Star Big Screen TV 150.1 91.7 91.7 65.1 48.9 75% 41.0 63% 39.7 61% Energy Star Set-Top Box 32.7 86.5 86.5 69.1 41.5 60% 34.3 50% 33.4 48% WINDOWS - Double-Glazed Clear to Energy Star 2.6 80.5 80.5 80.3 29.3 36% 10.3 13% 5.3 7% 14 SEER (12.15 EER) Split-System Air Conditioner 1.6 62.8 62.3 62.1 23.7 38% 5.5 9% 2.8 5% Whole House Fans 1.3 107.4 49.2 49.1 45.6 93% 6.6 13% 1.1 2% Whole House Fans 1.3 107.4 49.2 49.1 45.6 93% 6.6 13% 1.1 2% High Efficiency CD (EF=3.01 w/moisture sensor) 1.3 49.6 40.0 39.8 24.5 61% 7.9 20% 4.3 11% Energy Star Desktop PC 20.5 39.9 39.9 32.9 19.1 58% 16.4 50% 16.1 49% Air Source Heat Pump 2.9 38.8 38.8 38.1 19.2 50% 12.3 32% 7.5 20% Crawlspace insulation 5.7 35.8 35.8 35.7 33.4 94% 8.3 23% 3.0 8% Proper Refrigerant Charging and Air Flow 2.0 34.4 33.6 33.6 33.3 99% 8.8 26% 3.4 10% Energy Star DVD Player 17.7 21.0 21.0 17.8 10.1 56% 8.2 46% 8.0 45% Programmable Thermostat 2.8 19.8 19.7 19.6 19.6 100% 5.5 28% 2.1 11% Freezer (Energy Star) 1.3 19.5 19.5 19.3 13.1 68% 4.4 23% 2.6 13% Energy Star Home Audio 18.8 19.3 19.3 15.9 9.4 59% 7.6 48% 7.4 47% Freezer - Early Replacement (Energy Star) 1.5 18.2 18.2 18.2 17.2 95% 5.0 28% 2.0 11% High Efficiency One Speed Pool Pump (1.5 hp) 4.7 17.2 17.0 15.8 14.8 94% 11.7 74% 8.3 53% Two Speed Pool Pump (1.5 hp) 1.8 16.8 16.6 16.6 15.4 93% 7.4 45% 2.3 14% HE Room Air Conditioner - CEE Tier 1 EER 11.3 1.7 15.4 15.2 15.2 8.9 59% 2.8 18% 1.3 9% Energy Star TV 8.8 13.8 13.8 12.6 5.4 43% 4.6 36% 4.5 36% Proper Sizing and Quality Install 4.0 12.1 12.1 12.0 4.7 39% 1.6 14% 0.6 5% Ceiling R-0 to R-49 Insulation 2.8 10.2 10.1 10.0 9.9 99% 4.8 48% 1.8 18% ROB 2L4'T8, 1EB 0.9 41.8 10.0 10.0 0.7 7% 0.2 2% 0.1 1% Heat Pump Water Heater - Energy Star 0.6 67.7 9.6 9.6 7.2 75% 3.3 35% 1.4 14% Energy Star Cordless Phones 8.5 8.7 8.7 7.8 3.5 45% 2.9 37% 2.8 37% Energy Star CW CEE Tier 2 (MEF=2.0) 1.2 14.1 8.3 8.3 4.4 53% 2.0 24% 0.8 10% Pipe Wrap 3.8 7.5 7.5 7.2 6.8 94% 4.5 63% 2.3 32% Energy Star DTA (Digital to Analog Converter) 7.6 7.8 7.5 6.8 3.0 44% 2.5 37% 2.5 36% Duct Sealing - from 40% AHU to 12% 2.8 7.9 7.5 7.4 7.4 99% 2.7 36% 1.0 14% Plug Load Controls - Smart Power Strip 0.6 21.2 7.3 7.3 7.3 99% 0.1 1% 0.0 0% Low Flow Showerhead 1.5 Gal/Min 3.8 7.0 7.0 6.7 6.3 94% 4.7 70% 2.4 35% Duct Sealing - from 24% AHU to 12% 1.1 11.7 6.4 6.4 6.3 99% 1.7 27% 1.1 17% Wall Blow-in R-0 to R-13 Insulation 1.3 12.7 6.3 6.3 6.3 99% 2.1 33% 1.1 18% Energy Star Battery Chargers 5.3 5.4 5.2 4.8 1.7 36% 1.5 31% 1.5 30% Energy Star External Power Adapters 5.3 5.4 5.2 4.8 1.7 36% 1.5 31% 1.5 30% HE Water Heater (EF=0.93) 1.2 8.6 4.8 4.8 2.4 50% 1.1 23% 0.5 10% Faucent Aerators 3.2 4.4 4.4 4.2 4.0 94% 2.7 63% 1.2 29% Self Install Weatherization 1.8 4.2 4.0 3.9 3.7 94% 1.6 40% 0.6 15% Duct Insulation 4.7 3.9 3.9 3.9 3.9 100% 2.1 54% 0.9 23% Tankless Water Heater 0.7 25.4 3.9 3.9 1.4 36% 0.5 12% 0.2 6% Energy Star Laptop PC 7.9 2.2 2.2 2.0 0.9 45% 0.8 38% 0.7 36% Ceiling Fans 0.8 8.9 2.0 2.0 1.8 91% 0.1 5% 0.0 1% 10% better than Energy Star Dehumidifier 8.5 2.0 2.0 1.9 1.3 66% 0.7 36% 0.4 21% Ceiling R-11 to R-49 Insulation 0.8 0.4 0.0 0.0 0.0 99% 0.0 6% 0.0 1% New Construction Meausres Best Practice Home 1.4 279.3 263.9 253.4 221.4 87% 70.5 28% 63.2 25% ENERGY STAR Home 2.2 205.6 205.6 194.6 173.9 89% 69.6 36% 64.8 33% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-21 

### 5.2.2.2 Commercial Sector Figure 5-30 and Figure 5-31 show cumulative net achievable progr am savings by commercial program scenario. By 2020, net energy savings reach 1, 054 GWh under the 50-percent incentive scenario, 1,645 GWh under the 75-percent incentive scenario, and 2, 473 GWh under the 100-percent incentive scenario. Peak-demand savings by 2020 range from 191 MW in the 50-percent incentive scenario to 310 MW in the 75-percent incentive scenario to 527 MW in th e 100 percent incentive scen ario. Savings increases begin to taper off in the more advanced scenarios as the lighting measures begin to reach high saturation levels and increased program penetration becomes more difficult. Figure 5-30 Achievable Energy Savings: Commercial Sector

0 500 1,000 1,500 2,000 2,500 3,000 3,500

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual GWh Naturally Occurring 100% Incentive 75% Incentive 50% Incentive

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-22 

### Figure 5-31 Achievable Peak-Demand Savings: Commercial Sector

0 100 200 300 400 500 600 700

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative MW Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 5-32 and Figure 5-33 show the end-use distribution of energy and peak-demand savings. Lighting contributes most to both the energy and peak-dem and savings potential (except in the 100-percent incentive scenario), followed by cooling, data cen ter, and outdoor lighting measures. As one would expect, HVAC contributes a higher share to peak-d emand savings potential versus energy-savings potential. While office equipment measures are shown to be a contributor to net savings, no incentives are provided for measures affecting this end use. Rather , results show effects of program marketing and education efforts to make customers more aware of the benefits of implementing equipment powermanagement capabilities.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-23 

### Figure 5-32 Commercial Net Energy-Savings Potential by End Use (2020) Figure 5-33 Commercial Net Peak-Savings Potential by End-Use (2020)

913

159

339

90

102

19

161

44

44

25 665

102

138

39

65

19

121

29

20

18 423

53

65

17

38

19

64

20

8

13 0 200 400 600 800 1,000 Indoor Lighting
Outdoor Lighting
Cooling

Ventilation
Refrigeration
Office Equipment
Data Center/Server Water Heating
Vending Machines
Cooking

Cumulative Annual GWh 100% Incentives 75% Incentives 50% Incentives 139

4

204

17

11

2

21

6

4

3 100

3

82

6

7

2

16

4

2

2 63

1

39

3

4

2

8

3

1

2 0 50 100 150 200 250 Indoor Lighting
Outdoor Lighting
Cooling

Ventilation
Refrigeration
Office Equipment
Data Center/Server Water Heating
Vending Machines
Cooking

Cumulative Peak MW 100% Incentives 75% Incentives 50% Incentives



### Table 5-4 lists the various potentials for commercial me asures that passed cost-effectiveness screening. Lighting measures, especially the premium T8 ligh ting with electronic ballast and CFLs, account for much of the savings potential. Limited achievable program potential for office equipment measures reflect the fact that incentives are not being prov ided and that program savings are mainly from information-based efforts. Lower achievable program potentials for some replace-on-burnout measures (such as air conditioners, chillers, a nd ventilation motors) reflect the f act that these measures that have limited opportunities due to equipment lifecycles.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-24 

### Table 5-4 Measure-Specific Commercial Results (Cumulative to 2020) – GWh

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econo

mic Ach @75% Incentives % of Net Econo

mic Ach @50% Incentives % of Net Econo

mic CFL Screw-in 18W 126.2 369.1 369.1 64.7 58.7 91% 54.5 84% 44.2 68% High Performance Lighting R/R - 25% Savings 9.2 307.2 307.2 296.9 114.7 39% 82.8 28% 63.2 21% RET 2L4' Premium T8, 1EB 7.9 182.1 182.1 143.3 140.6 98% 122.8 86% 87.0 61% High Pressure Sodium 250W Lamp 1.1 177.0 166.1 157.5 145.5 92% 89.9 57% 42.9 27% RET 4L4' Premium T8, 1EB 19.8 147.3 147.3 54.7 52.7 96% 49.3 90% 42.9 78% CFL Hardwired, Modular 18W 4.4 123.0 123.0 112.4 65.7 58% 36.0 32% 14.6 13% RET 2L4' Premium T8, 1EB, Reflector 16.0 111.7 111.7 95.0 93.4 98% 84.3 89% 53.1 56% PC Network Power Management Enabling 37.2 95.3 95.3 38.7 11.0 29% 11.0 29% 11.0 29% Data Center Best Practices 68.3 93.1 93.1 88.5 82.5 93% 65.2 74% 25.1 28% ROB 2L4' Premium T8, 1EB 8.7 87.5 87.5 83.5 40.4 48% 30.5 37% 23.8 28% Data Center Improved Operations 167.7 81.3 81.3 50.9 45.6 90% 44.2 87% 36.7 72% Occupancy Sensor, 8L4' Fluorescent Fixtures 3.6 81.3 81.3 78.0 72.3 93% 46.8 60% 20.8 27% Occupancy Sensor, 4L4' Fluorescent Fixtures 2.8 79.4 79.4 77.6 71.7 92% 37.0 48% 13.5 17% DX Packaged System, EER=10.9, 10 tons 5.2 79.3 79.3 78.4 41.1 52% 19.4 25% 12.0 15% Aerosol Duct Sealing - DX 2.9 73.6 73.6 72.4 66.5 92% 22.3 31% 8.8 12% ROB 4L4' Premium T8, 1EB 6.6 71.2 71.2 69.3 26.2 38% 18.5 27% 13.8 20% Vending Misers (cooled machines only) 3.7 50.2 49.2 47.0 43.6 93% 20.3 43% 7.8 17% Energy Star or Better PC 53.5 45.8 45.8 8.8 3.9 44% 3.9 44% 3.9 44% RET 1L4' Premium T8, 1EB, Reflector OEM 7.2 45.6 45.6 44.8 44.2 98% 25.0 56% 7.2 16% Economizer - DX 2.0 48.0 41.8 40.4 37.3 92% 17.4 43% 8.2 20% Heat Recovery Unit 8.4 41.4 40.7 29.5 26.7 91% 17.4 59% 11.2 38% Data Center State of the Art practices 35.4 35.7 35.7 35.5 33.2 93% 11.9 34% 2.2 6% Convection Oven 7.7 33.4 33.4 31.1 23.9 77% 17.2 55% 13.2 43% Freezer-Cooler Replacement Gaskets 14.6 29.2 29.2 13.7 11.8 86% 10.3 75% 8.2 60% DX Coil Cleaning 6.2 27.3 27.3 25.8 24.0 93% 14.7 57% 7.4 29% PSMH + electronic ballast 2.3 25.3 25.3 24.8 22.4 90% 9.9 40% 3.5 14% Cool Roof - DX 4.2 32.6 24.8 23.1 21.1 91% 7.0 30% 3.5 15% Centrifugal Chiller, 0.51 kW/ton, 500 tons 6.6 24.4 24.4 24.2 9.5 39% 5.1 21% 3.3 14% Window Film (Standard) - DX 4.0 35.7 24.4 23.5 21.7 92% 9.4 40% 4.7 20% High Bay T5 5.3 23.2 23.2 20.6 18.8 91% 13.9 67% 8.5 41% PC Manual Power Management Enabling 11.4 22.9 22.9 19.5 0.8 4% 0.8 4% 0.8 4% Printer Power Management Enabling 3.5 22.3 22.3 22.0 0.2 1% 0.2 1% 0.2 1% Monitor Power Management Enabling 30.8 22.3 22.3 13.8 2.2 16% 2.2 16% 2.2 16% Variable Speed Drive Control, 40 HP 2.5 21.8 21.7 20.1 18.6 92% 11.1 55% 6.1 31% Heat Pump Water Heater (air source) 7.9 21.4 21.4 20.5 10.7 52% 7.5 36% 5.7 28% High-efficiency fan motors 1.9 21.7 21.4 21.1 19.5 93% 7.8 37% 2.5 12% LED Exit Sign 2.5 20.2 20.2 19.9 19.6 98% 9.8 49% 2.9 15% Prog. Thermostat - DX 1.8 22.4 19.4 18.8 17.3 92% 8.0 43% 3.7 20% Induction High Bay Lighting 1.9 19.1 19.1 19.0 17.5 92% 5.5 29% 1.7 9% Geothermal Heat Pump, EER=13, 10 tons - DX 6.7 18.9 18.9 18.2 16.8 93% 9.4 52% 4.4 24% RET 2 - 1L4' Premium T8, 1EB, Reflector OEM 6.9 18.6 18.6 18.3 18.1 98% 9.7 53% 2.6 14% Outdoor Lighting Controls (Photocell/Timeclock) 4.3 18.6 18.6 13.4 13.1 98% 12.4 93% 9.7 73% Oversized Air Cooled Condenser 3.5 18.5 18.5 17.2 16.9 98% 12.6 73% 6.8 40% Variable Speed Drive Control, 5 HP 0.9 28.8 17.7 17.5 16.1 92% 5.2 30% 1.8 10% Night covers for display cases 2.8 16.9 16.8 14.9 13.8 92% 10.4 69% 6.4 43% RET 2 - 2L4' Premium T8, 1EB 7.2 15.1 15.1 12.4 12.1 98% 10.4 84% 7.2 58% Variable Speed Drive Control, 15 HP 1.5 17.6 14.7 14.2 13.1 92% 6.3 44% 2.9 21% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-25 

### Table 5-4 (Continued) Measure-Specific Commercial Results (Cumulative to 2020) – GWh

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econo

mic Ach @75% Incentives % of Net Econo

mic Ach @50% Incentives % of Net Econo

mic PSMH, magnetic ballast, 320 W 32.5 14.1 14.1 4.5 3.5 80% 3.2 73% 2.8 63% Energy Recovery Ventilation (ERV) 1.9 17.6 14.1 14.0 12.8 92% 3.2 23% 1.0 7% Fan Motor, 5hp, 1800rpm, 89.5% 2.1 13.9 13.3 13.2 7.6 58% 3.0 23% 1.7 13% Ceiling/roof Insulation - DX 2.3 13.8 12.8 12.6 11.6 92% 3.1 24% 1.0 8% Economizer - Chiller 1.2 17.3 12.1 12.0 11.8 98% 2.3 19% 0.5 4% Air Handler Optimization, 15 HP 2.6 11.5 11.4 11.3 10.5 93% 4.7 42% 1.4 13% Refrigeration Commissioning 1.5 11.7 11.4 11.2 10.4 93% 4.3 39% 1.4 13% DX Tune Up/ Advanced Diagnostics 1.4 14.1 11.3 11.3 10.3 92% 2.5 22% 0.7 7% VSD for Chiller Pumps and Towers 3.7 11.2 11.2 10.9 10.1 92% 4.5 42% 2.0 19% Occupancy Sensor, High Bay T5 9.7 11.2 11.2 10.3 6.8 66% 5.5 54% 4.4 43% Optimize Controls - DX 1.4 13.0 10.5 10.2 9.4 92% 4.2 41% 1.9 18% Lighting Control Tuneup 7.5 10.0 10.0 8.5 8.2 97% 7.0 82% 4.7 55% High Efficiency Chiller Motors 2.7 9.5 9.5 9.5 9.3 98% 2.3 24% 0.5 5% Anti-sweat (humidistat) controls 4.4 9.4 9.4 8.1 7.5 92% 5.7 71% 3.7 45% Chiller Tune Up/Diagnostics 1.4 8.8 8.8 8.7 8.0 92% 2.3 27% 0.8 9% Air Handler Optimization, 40 HP 3.0 9.4 8.6 8.4 7.9 93% 4.4 52% 1.4 17% Demand Defrost Electric 36.3 8.5 8.5 2.3 1.8 77% 1.6 70% 1.4 61% Solar Water Heater 2.7 8.0 8.0 8.0 3.1 39% 1.4 18% 0.9 11% EMS - Chiller 1.6 7.6 7.6 7.4 6.8 91% 2.0 27% 0.9 12% High R-Value Glass Doors 1.7 7.1 7.1 7.0 6.5 93% 2.6 37% 0.8 11% Strip curtains for walk-ins 6.0 6.4 6.4 4.9 4.5 91% 3.7 75% 2.6 53% Heat Trap 14.0 5.4 5.4 3.1 2.7 89% 2.3 75% 1.7 56% EMS Optimization - Chiller 1.2 5.0 5.0 4.9 4.5 92% 1.6 33% 0.6 12% Energy Star or Better Monitor 104.1 4.7 4.7 0.8 0.4 46% 0.4 46% 0.4 46% Compressor VSD retrofit 1.7 4.7 4.5 4.4 4.1 93% 1.9 44% 0.7 16% Efficient compressor motor 9.6 4.3 4.3 3.9 3.0 76% 2.3 58% 1.8 46% Occupancy Sensor, 4L8' Fluorescent Fixtures 3.5 3.8 3.8 3.6 3.3 93% 2.0 54% 0.9 24% Demand Hot Gas Defrost 12.7 3.7 3.7 2.0 1.8 88% 1.5 77% 1.2 63% Fan Motor, 15hp, 1800rpm, 92.4% 2.3 3.1 3.0 2.9 1.7 58% 0.7 24% 0.4 14% Copier Power Management Enabling 0.9 3.2 2.4 2.4 0.0 0% 0.0 0% 0.0 0% Continuous Dimming, 10L4' Fluorescent Fixtures 0.9 74.8 2.2 2.2 2.0 91% 0.4 18% 0.1 4% Fan Motor, 40hp, 1800rpm, 94.1% 1.9 1.7 1.7 1.7 1.0 57% 0.3 21% 0.2 11% ECM on an Air Handler Unit 4.2 1.5 1.5 1.5 0.8 53% 0.4 27% 0.3 17% Window Film (Standard) - Chiller 1.3 4.0 1.4 1.4 1.3 92% 0.2 17% 0.1 4% High Efficiency Water Heater (electric) 4.7 1.3 1.3 1.3 0.7 53% 0.4 32% 0.3 23% Efficient Fryer 1.0 2.3 1.0 1.0 0.7 76% 0.3 33% 0.2 20% Energy Star or Better Copier 62.6 0.8 0.8 0.2 0.1 40% 0.1 40% 0.1 40% Tankless Water Heater 2.4 0.9 0.8 0.8 0.3 39% 0.1 19% 0.1 11% Ceiling/roof Insulation - Chiller 1.9 0.9 0.7 0.7 0.6 98% 0.1 16% 0.0 3% Floating head pressure controls 7.1 0.4 0.4 0.3 0.2 90% 0.2 70% 0.1 51% Demand controlled circulating systems 8.7 0.3 0.2 0.1 0.1 97% 0.1 71% 0.1 50% Separate Makeup Air / Exhaust Hoods AC 77.6 0.2 0.2 0.0 0.0 86% 0.0 82% 0.0 76% Evaporator fan controller for MT walk-ins 0.6 1.3 0.1 0.1 0.1 93% 0.0 59% 0.0 30% Hot Water Pipe Insulation 1.2 0.0 0.0 0.0 0.0 98% 0.0 48% 0.0 18% New Construction Meausres High Performance Building/Int Design - Tier 2 50% 10.3 489.5 489.5 476.5 305.9 64% 227.1 48% 170.2 36% High Performance Building/Int Design - Tier 1 30% 12.3 440.5 440.5 426.0 272.3 64% 211.1 50% 164.2 39% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive. 

### 5.2.2.3 Industrial Sector Figure 5-34 and Figure 5-35 show cumulative net achievable program savings by industrial program scenario. By 2020, net energy savings reach 184 GW h under the 50-percent incentive scenario, 285 GWh under the 75-percent incentive scenario, and 374 GWh un der the 100-percent incentive scenario. For peak

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-26 

### demand, net savings increase from 24 MW under 50 -percent incentives to 39 MW under 75-percent incentives to 52 MW under 100-percent incentives. Figure 5-34 Achievable Energy Savings: Industrial Sector

0 50 100 150 200 250 300 350 400 450 500

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual GWh Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 5-35 Achievable Peak-Demand Savings: Industrial Sector

0 10 20 30 40 50 60 70

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Peak MW Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 5-36 and Figure 5-37 show the end-use distribution of energy and peak-demand savings in the industrial sector. Pumping-system measures contribut e most to both the energy and peak-demand savings potential, followed by lighting and compressed-air measures.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-27 

### Figure 5-36 Industrial Net Energy-Savings Potential by End-Use (2020) Figure 5-37 Industrial Net Peak-Savings Potential by End-Use (2020)

55

39

133

19

7

7

17

97

2 48

24

106

10

4

5

9

78

1 40

14

70

7

2

3

5

43

0 0 20 40 60 80 100 120 140 Compressed Air

Fans
Pumps

Drives
Heating
Refrigeration
Cooling
Lighting

Other

Cumulative Annual GWh 100% Incentives 75% Incentives 50% Incentives 7

4

17

3

1

1

4

15

0 6

2

13

2

1

1

2

12

0 5

1

9

1

0

1

1

7

0 0 5 10 15 20 Compressed Air

Fans
Pumps

Drives
Heating
Refrigeration
Cooling
Lighting

Other

Cumulative Peak MW 100% Incentives 75% Incentives 50% Incentives



### Table 5-5 lists the various potentials for industrial me asures that passed cost-e ffectiveness screening. There are a large number of industrial measures that contribute to industrial savings potential. Limited penetration of some industrial me asures is, in part, due equipment turnover cycles that limit energyefficiency opportunities. In addition, some of the key process measures, such as installation of controls and process optimization, tend to have high market ba rriers, such as lack of customer knowledge about the measure and the need to take their plant out of operation to install measures.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-28 

### Table 5-5 Measure-Specific Industrial Results (Cumulative to 2020) – GWh

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econo

mic Ach @75% Incentives % of Net Econo

mic Ach @50% Incentives % of Net Econo

mic RET 2L4' Premium T8, 1EB 3.4 74.1 74.1 71.8 71.6 100% 56.2 78% 27.6 38% Pumps - Controls 10.3 73.2 73.2 69.9 30.4 44% 20.7 30% 13.5 19% Pumps - System Optimization 4.0 59.0 59.0 55.4 55.3 100% 48.3 87% 30.2 55% Compressed Air-O&M 13.4 38.1 38.1 20.0 12.8 64% 12.8 64% 12.8 64% Compressed Air - System Optimization 9.3 27.9 27.9 19.4 19.4 100% 18.8 97% 16.8 86% Fans - Controls 3.1 26.8 26.8 26.7 12.1 45% 3.8 14% 1.3 5% Pumps - O&M 17.0 25.3 25.3 10.3 7.4 72% 7.4 72% 7.4 72% Pumps - Sizing 7.7 23.2 23.2 22.6 10.1 45% 6.1 27% 3.6 16% CFL Hardwired, Modular 36W 4.0 20.2 20.2 18.6 18.5 100% 18.3 99% 13.9 75% Pumps - ASD (100+ hp) 2.9 15.2 15.2 14.0 14.0 100% 12.5 89% 8.4 60% Centrifugal Chiller, 0.51 kW/ton, 500 tons 5.5 13.4 13.4 13.2 3.0 23% 1.3 10% 0.8 6% Pumps - ASD (6-100 hp) 13.2 12.6 12.6 4.7 4.7 100% 4.6 98% 4.4 94% Compressed Air- Sizing 17.4 11.7 11.7 10.7 4.3 41% 3.3 31% 2.5 23% Fans - System Optimization 2.3 9.4 9.4 9.2 9.2 100% 6.9 75% 3.1 34% DX Packaged System, EER=10.9, 10 tons 1.5 9.2 9.2 9.2 2.7 29% 0.5 6% 0.2 2% Fans - ASD (100+ hp) 3.5 9.0 9.0 7.9 7.9 100% 7.3 92% 5.4 68% Comp Air - ASD (100+ hp) 2.9 7.8 7.8 7.2 7.2 100% 6.4 89% 4.3 60% Compressed Air - Controls 4.6 7.4 7.4 7.3 3.3 45% 1.5 20% 0.7 9% Occupancy Sensor, 4L4' Fluorescent Fixtures 2.1 6.8 6.8 6.7 6.7 100% 3.8 57% 1.2 18% Comp Air - ASD (6-100 hp) 13.2 6.4 6.4 5.8 2.3 40% 1.8 31% 1.4 24% Efficient Curing ovens 3.3 6.4 6.4 6.4 2.0 31% 0.6 9% 0.2 3% Prog. Thermostat - DX 13.7 6.1 6.1 2.5 2.5 100% 2.5 98% 2.4 93% Optimization Refrigeration 3.7 5.6 5.6 5.4 5.4 100% 4.1 76% 1.9 35% Bakery - Process (Mixing) - O&M 16.6 4.9 4.9 2.1 1.5 71% 1.5 71% 1.5 71% Window Film - DX 3.0 4.4 4.4 4.3 4.3 100% 3.0 71% 1.3 29% Window Film - Chiller 1.6 4.0 4.0 4.0 4.0 100% 1.3 33% 0.3 7% Efficient processes (welding, etc.) 6.3 4.0 4.0 3.9 1.2 31% 0.6 16% 0.3 8% Heating - Process Control 3.8 3.7 3.7 3.7 1.2 31% 0.4 10% 0.1 4% Efficient electric melting 4.3 3.6 3.6 3.6 0.8 23% 0.3 8% 0.1 3% Pumps - Motor practices-1 (100+ HP) 2.4 3.5 3.5 3.4 3.4 100% 2.5 74% 1.1 32% Fans - ASD (6-100 hp) 7.7 3.3 3.3 3.2 1.4 44% 0.9 29% 0.6 19% Efficient practices printing press 13.3 3.3 3.3 2.0 2.0 100% 2.0 97% 1.8 89% Pumps - Motor practices-1 (6-100 HP) 2.3 3.3 3.3 3.2 3.2 100% 2.2 67% 0.8 25% Efficient Refrigeration - Operations 16.7 3.2 3.2 3.0 1.2 42% 0.9 31% 0.7 22% Fans- Improve components 8.3 3.1 3.1 3.0 1.3 44% 0.8 28% 0.5 17% Extruders/injection Moulding-multipump 3.7 3.0 3.0 3.0 1.2 39% 0.4 13% 0.1 5% Fans - O&M 16.8 3.0 3.0 1.3 0.9 71% 0.9 71% 0.9 71% Efficient grinding 1.1 2.8 2.8 2.8 0.8 29% 0.0 2% 0.0 0% Efficient Printing press (fewer cylinders) 3.0 2.8 2.8 2.8 1.3 45% 0.4 14% 0.1 5% Pumps - Replace 100+ HP motor 1.2 2.7 2.7 2.7 1.7 62% 0.2 7% 0.0 1% Fans - Motor practices-1 (6-100 HP) 3.5 2.4 2.4 2.3 2.3 100% 1.9 83% 1.0 46% Drives - Process Controls (batch + site) 1.8 2.9 2.4 2.4 1.1 45% 0.2 8% 0.1 2% Clean Room - Controls 3.2 2.4 2.4 2.3 1.1 45% 0.3 15% 0.1 5% Refinery Controls 4.3 2.1 2.1 2.0 1.9 92% 1.6 78% 1.0 49% O&M - Extruders/Injection Moulding 20.6 2.1 2.1 2.0 0.2 11% 0.2 11% 0.2 11% Drives - Optimization process (M&T) 11.7 2.0 2.0 1.3 1.3 100% 1.2 97% 1.1 89% Bakery - Process 10.8 2.0 2.0 1.9 0.6 30% 0.4 20% 0.2 12% Heating - Optimization process (M&T) 11.3 1.9 1.9 1.2 1.2 100% 1.2 97% 1.1 89% Air conveying systems 11.9 1.9 1.9 1.8 0.5 30% 0.4 22% 0.3 16% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-29 

### Table 5-5 (Continued) Measure-Specific Industrial Results (Cumulative to 2020) – GWh

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econo

mic Ach @75% Incentives % of Net Econo

mic Ach @50% Incentives % of Net Econo

mic Comp Air - Motor practices-1 (100+ HP) 2.6 1.8 1.8 1.8 1.8 100% 1.4 75% 0.6 34% Efficient drives - rolling 5.4 1.8 1.8 1.8 0.8 45% 0.4 22% 0.2 10% Comp Air - Motor practices-1 (6-100 HP) 2.5 1.8 1.8 1.7 1.7 100% 1.2 69% 0.5 27% Fans - Replace 100+ HP motor 1.6 1.7 1.7 1.7 1.1 63% 0.2 10% 0.0 2% Direct drive Extruders 2.4 1.6 1.6 1.6 0.6 38% 0.1 8% 0.0 2% Drives - EE motor 4.7 1.5 1.5 1.5 0.7 45% 0.3 21% 0.1 9% Drives - Process Control 3.9 1.5 1.5 1.5 0.5 31% 0.1 10% 0.1 4% Comp Air - Replace 100+ HP motor 1.3 1.5 1.5 1.4 0.9 62% 0.1 7% 0.0 1% Light cylinders 1.1 1.2 1.2 1.2 0.5 43% 0.0 3% 0.0 0% Machinery 5.0 1.2 1.2 1.2 0.5 45% 0.2 20% 0.1 9% Fans - Motor practices-1 (100+ HP) 2.2 1.2 1.2 1.2 1.2 100% 0.6 53% 0.2 16% Injection Moulding - Impulse Cooling 3.0 1.1 1.1 1.1 0.4 39% 0.1 11% 0.0 3% Drives - Scheduling 3.1 1.1 1.1 1.0 1.0 100% 0.9 87% 0.5 54% Near Net Shape Casting 12.7 1.0 1.0 1.0 0.3 29% 0.2 20% 0.1 13% Optimize drying process 3.6 1.0 1.0 0.9 0.9 100% 0.8 82% 0.4 43% Chiller Tune Up/Diagnostics 1.3 1.0 1.0 1.0 0.0 4% 0.0 2% 0.0 1% Replace V-Belts 5.7 1.0 1.0 0.9 0.4 46% 0.3 27% 0.2 16% Injection Moulding - Direct drive 1.9 1.0 1.0 1.0 0.4 38% 0.1 6% 0.0 1% Pumps - Motor practices-1 (1-5 HP) 1.5 0.9 0.9 0.9 0.9 100% 0.3 35% 0.1 8% Other Process Controls (batch + site) 2.7 0.8 0.8 0.8 0.3 45% 0.1 13% 0.0 4% New transformers welding 6.8 0.7 0.7 0.7 0.2 31% 0.1 16% 0.1 8% Efficient drives 4.9 0.6 0.6 0.6 0.3 45% 0.1 21% 0.1 10% Clean Room - New Designs 2.2 0.6 0.6 0.6 0.3 45% 0.1 10% 0.0 3% Process control 7.7 0.6 0.6 0.6 0.3 45% 0.2 27% 0.1 16% Fans - Motor practices-1 (1-5 HP) 1.9 0.6 0.6 0.5 0.5 100% 0.3 49% 0.1 14% Heating - Scheduling 3.2 0.6 0.6 0.5 0.5 100% 0.5 88% 0.3 56% Comp Air - Motor practices-1 (1-5 HP) 1.6 0.5 0.5 0.5 0.5 100% 0.2 38% 0.0 9% Optimization control PM 2.8 0.4 0.4 0.4 0.4 100% 0.3 78% 0.2 39% Process optimization 2.7 0.4 0.4 0.4 0.4 100% 0.3 75% 0.1 34% Power recovery 1.9 0.4 0.4 0.4 0.4 100% 0.2 51% 0.1 15% O&M/drives spinning machines 7.9 0.3 0.3 0.3 0.1 23% 0.1 23% 0.1 23% Heat Pumps - Drying 1.8 0.3 0.3 0.3 0.1 30% 0.0 3% 0.0 1% Top-heating (glass) 6.8 0.3 0.3 0.3 0.1 52% 0.1 32% 0.1 19% EMS - Chiller 0.9 6.1 0.2 0.2 0.2 100% 0.0 13% 0.0 2% Cool Roof - DX 0.9 4.8 0.2 0.2 0.2 100% 0.0 12% 0.0 2% Gap Forming papermachine 11.8 0.1 0.1 0.1 0.0 22% 0.0 15% 0.0 10% High Consistency forming 11.7 0.1 0.1 0.1 0.0 22% 0.0 15% 0.0 10% Drying (UV/IR) 3.7 0.1 0.1 0.1 0.1 53% 0.0 19% 0.0 7% Process Drives - ASD 2.3 0.1 0.1 0.1 0.1 100% 0.1 69% 0.0 27% Intelligent extruder (DOE) 1.0 0.1 0.1 0.1 0.0 42% 0.0 2% 0.0 0% Efficient desalter 4.2 0.1 0.1 0.1 0.0 45% 0.0 20% 0.0 9% Cooling Circ. Pumps - VSD 0.6 3.0 0.0 0.0 0.0 99% 0.0 5% 0.0 1% Evaporative Pre-Cooler 0.7 3.7 0.0 0.0 0.0 100% 0.0 9% 0.0 2% Metal Halide, 50W 0.5 1.9 0.0 0.0 0.0 100% 0.0 10% 0.0 2% Pumps - Replace 6-100 HP motor 0.6 3.0 0.0 0.0 0.0 41% 0.0 1% 0.0 0% Fans - Replace 6-100 HP motor 0.7 1.6 0.0 0.0 0.0 42% 0.0 1% 0.0 0% Membranes for wastewater 6.1 0.0 0.0 0.0 0.0 31% 0.0 11% 0.0 4% Comp Air - Replace 6-100 HP motor 0.6 1.6 0.0 0.0 0.0 41% 0.0 1% 0.0 0% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-30 

# 5.3 Behavioral Conservation and Emerging Technologies In addition to the base potentials forecast that are described above, we also investigated the effects of behavioral conservation and emerging technologies. The impacts of these components are much more uncertain than the impacts of the more standard, co mmercially available measures that are included in the base analysis, and this is why they receive separate treatment. 

## 5.3.1 Behavioral Conservation Two types of residential behavioral-conservation meth ods are addressed in the analysis: (1) indirect feedback approaches, which utilize en ergy information reports that motiv ate customers to use less, and (2) direct feedback interventions, such use of in-home energy use monitors. Both of these approaches have shown some promise in motivating customers to use less energy. However, factors such as persistence and the expected amount of energy savings have not been tested over a significant period of time or across a wide range of customers. For this analysis, we assumed that indirect feedb ack measures would save about two percent of household energy consumption at a cost of about $10 per cu stomer per year (split between the electric and gas programs). These measures could be targeted to the entire residential population. Direct methods would save about five percent per year at an equipment cost of about $140 per customer, with a measure life of four years. These direct methods could be applied to between five and ten percent of the residential population. These measure parameters are consiste nt with findings from recent pilot studies being conducted in various locales over the past several years. 8 

### Figure 5-38 shows the effects on technical and economi c potential from adding behavioral-conservation measures to the analysis. Behavioral conservation adds 218 GWh of technical potential and 216 GWh of economic potential to the base amounts. The behavior al-conservation potentials amount to an increase in total economic potential of about three percent and an increase to residential economic potential of about eight percent. The indirect feedback approaches account for 90 percent of the behavioral-conservation potentials since they are applicable to a much larg er number of customers than the direct feedback measures.

8 

### For example see Franklyn Energy, Research Study: Residential Energy Use Behavior Change Pilot , Presented to the Minnesota Department of Commerce, Office of Energy S ecurity, April 2009.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-31 

### Figure 5-38 Electric Technical and Economic Potentials with Behavioral-Conservation Activities

8,894 7,563 9,112 7,779

0 2,000 4,000 6,000 8,000 10,000 12,000

Technical EconomicCumulative Annual GWh Base Analysis With Conservation



### For the achievable potential assessment of the be havioral-conservation measures, we focused on the indirect interventions and developed three scenarios:

• 

### A low scenario that targets only the largest residential electricity users, about 0.15 million customers with average use of about 15,000 kWh per year

• 

### A mid scenario that targets both large and medium residential electricity users, about 0.6 million customers with combined average el ectricity use of 9,500 kWh per year

• 

### A high scenario that targets all residential cust omers, about 1.2 million customers with average electricity use of 7,600 kWh per year In each case, program efforts were ramped up over a three-year period. Table 5-6 summarizes the results of the analysis over the 2010-2020 time period. As shown, behavioral-conservation potentials—if the assumptions outlined above hold up—could save be tween 44 and 176 GWh in annual program costs averaging between $9 million and $68 million dollars, depe nding on how many customers are targeted for the indirect interventions. (It is also possible th at Xcel Energy could reduce program costs by better targeting customers, so these estimates are probably an upper-bound of program costs.) All scenarios have TRC ratios that are greater than 1.0, the cutoff for cost-effectiveness. The scenarios that target the larger users show the highest TRC ratios because ener gy savings per customer are assumed to be higher, while program costs are the sa me as for lower-use customers.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-32 

### Table 5-6 Achievable Potentials for Electric Behavioral Conservation Scenario Result Low Large Users Only Medium: Lrg-Med Users High: All Customers Gross Energy Savings - GWh 43.7 107.4 175.8 Gross Peak Demand Savings - MW 10.7 26.3 43.1 Net Energy Savings - GWh 43.7 107.4 175.8 Net Peak Demand Savings - MW 10.7 26.3 43.1 Program Costs - Real, $ Million Administration $0.1 $0.4 $0.8 Marketing $8.4 $32.6 $67.0 Incentives $0.0 $0.0 $0.0 Total $8.6 $33.0 $67.8 PV Avoided Costs $35.1 $86.2 $141.0 PV Annual Marketing and Admin Costs $6.3 $24.2 $49.8 PV Net Measure Costs $0.0 $0.0 $0.0 TRC Ratio 5.6 3.6 2.8 PV (present value) of benefits and costs is calculated over a 20-year normalized measure life for 2010-2020 program years, nominal discount rate = 7.9 percent, inflation rate = 1.5 percent; GWh and MW savings are cumulative through 2020.


## 5.3.2 Emerging Technologies The ultimate impacts and timing of emerging technol ogies are very uncertain due to both technological and market barriers. Despite these uncertainties associ ated with particular technologies, we know that energy-efficiency measures will continue to evolve , and emerging technologies will play a significant role in future program years. In order to address the possible effects of emerging energy-efficiency measures, we focused our potential analysis on several of the more promising emerging technologies:

• 

### LED lighting, including LED street lighting, LED replacements for incandescent/CFL lighting in the residential sector, and LED replacements for fluorescent tube lighting in the commercial sector;

• 

### Induction street lighting, which is somewhat less e fficient and also less costly than LED lighting;

• 

### Fiber-optic refrigeration display lighting; and

• 

### Indirect evaporative cooling in the residential sector. For the analysis, we assumed that these measures we re all commercially available and could provide claimed savings. We also assumed equipment costs th at made these measures commercially viable. For

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-33 

### the lighting measures, additional technology deve lopment will be required to make the equipment commercially viable for the majority of customers. For the indirect evaporative coolers, customer acceptance is the biggest source of uncertainty, since th ere is currently equipment available in the market, although market share is negligible. Measure cost s and savings are presented in Appendix E, along with the other measures that comprise the base analysis. We modeled the incremental effects of emerging technologies using the KEMA DSM Assyst model. Below, we present results for technical, economic, and achievable potentials. For the achievable potentials, we do not include firm program years, since it is unclear how long it might take before these technologies achieve any significant market penetration, if any at all. Figure 5-39 and Figure 5-40 show the effects on economic pot ential (energy and peak demand, respectively) from the addition of emerging technologies. Overall, economic potential increases by 1,800 GWh (24 percent) and 628 MW (36 percent) when emerging technologies are considered. Economic potential for energy savings increases by about the same rate for the residential and commercial sectors, but economic peak-demand potential increases most in th e residential sector (61 percent for the residential sector as compared to 15 percent in the commercial sector) as a result of the indirect evaporative cooler measure. Figure 5-39 Electric Energy Economic Potentials with Emerging Technologies (11 Years)

2,813 4,145 7,563

3,610 5,148 9,363

0 2,000 4,000 6,000 8,000 10,000 12,000

Residential Commercial TotalCumulative Annual GWh Base With Emerging Tech

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-34 

### Figure 5-40 Peak-Demand Economic Potentials with Emerging Technologies (11 Years)

818 826 1,730 1,320 952 2,358

0 500 1,000 1,500 2,000 2,500 3,000

Residential Commercial TotalCumulative Peak MW Base With Emerging Tech



### Figure 5-41 and Figure 5-42 show the end-use composition of residential economic potentials for energy and peak demand, respectively, with and without emerging technologies. These figures show that air conditioning (as a result of the indirect evaporative coolers) accounts for about 72 percent of the increase in energy potentials and about 96 percent of th e increase in peak-demand potentials resulting from the emerging technologies. Note that the analysis considers not only the effect of the emerging technologies but also the effects these technologies would have on other energy-efficiency me asures. The indirect evaporative coolers would, by themselves, have even larger impacts, since they could save 80 percent on cooling compared to current air conditioners. However, if these units reach widesp read penetration, many of the current base cooling measures would no longer be cost effective, so the net gain in economic potential is not as great as it would be if the emerging measure was considered in is olation. Also, it should be noted that savings from LED lighting in the residential sector is based off of a CFL base case, since it is most likely that CFLs will have captured much of the market by the time LED lighting becomes commercially feasible.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-35 

### Figure 5-41 Residential Electric Economic Potentials with Emerging Technologies (11 Years)

672 775 2,476

1,245 998 3,273

0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000

Air Condtioning Lighting TotalCumulative Annaul GWh Base With Emerging Tech



### Figure 5-42 Residential Peak-Demand Economic Potentials with Emerging Technologies (11 Years)

518

72 742 998

93 1,244

0 200 400 600 800 1,000 1,200 1,400 1,600

Air Condtioning Lighting TotalCumulative Peak MW Base With Emerging Tech



### Figure 5-43 and Figure 5-44 show the end-use composition of commercial economic potentials for energy and peak demand, respectively, with and without em erging technologies. While LED streetlighting is likely to be more of a near-term measure (if current pilots prove successful), the application of LED lighting to indoor tube fixtures would provide a much larger source of energy savings.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-36 

### Figure 5-43 Commercial Electric Economic Potentials with Emerging Technologies (11 Years)

1,868

195 150 3,397
2,536

476 204 4,400

0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000

Indoor Lighting Outdoor Lighting Refrigeration TotalCumulative Annual GWh Base With Emerging Tech



### Figure 5-44 Commercial Peak-Demand Economic Potentials with Emerging Technologies (11 Years)

293

5 16 688

400

18 23 814

0 100 200 300 400 500 600 700 800 900

Indoor Lighting Outdoor Lighting Refrigeration TotalCumulative Peak MW Base With Emerging Tech



### Figure 5-45 and Figure 5-46 show achievable potential estimates for residential and commercial emerging technologies, respectively. For residential, cumu lative savings over an 11-year period range from 55 GWh for the 50-percent incentives case to 108 GWh for the 75-percent incentives case to 385 GWh for the 100 percent incentives case. About three-quarters of the residential potentials come from the indirect evaporative cooler measure. For commercial, cumu lative savings over the 11-year period range from 64

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-37 

### GWh for the 50-percent incentives case to 227 GWh for the 75-percent incentives case to 606 GWh for the 100 percent incentives case. Most of the commercial savings are attributable to indoor LED lighting measures. Figure 5-45 Achievable Potentials for Residential Emerging Technologies

0 50 100 150 200 250 300 350 400 450

1 2 3 4 5 6 7 8 9 10 11 YearCumulative Annual GWh Nat Occ 100% Incentives 75% Incentives 50% Incentives



### Figure 5-46 Achievable Potentials for Commercial Emerging Technologies

0 100 200 300 400 500 600 700

1 2 3 4 5 6 7 8 9 10 11 YearCumulative Annual GWh Nat Occ 100% Incentives 75% Incentives 50% Incentives



### Note that the achievable potential estimates are highly uncertain since they are based on factors that are difficult to predict—technology improvement and cust omer adoption of new devices. Also note that we did not place dates on the annual projections, because it is still unclear if and when these technologies will

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-38 

### be ready for full-scale implementation. We expect that Xcel Energy will want to run pilot programs to test measure performance and customer acceptance be fore expanding to large-scale investment in these measures. We expect that relatively high incentives may be required to effectively promote the emerging technologies. Hence, savings for the 50-percent and 75-percent incentive scenarios are relatively low compared to the 100-percent incentive scenario. A dditionally, we expect that naturally occurring penetration of these measures will be low, at least at the onset. 

# 5.4 Alternate High Avoided-Cost Scenario As indicated in section 3 above, we tested the sensitiv ity of the energy-efficiency potential analysis to increases in avoided costs by running a high avoided-co st scenario where electric avoided costs are about 35 percent higher than for the base scenario. In this section, we present a comparison of potentials between the base-cost scenario and the high-cost scen ario. Economic potentials are compared first, followed by a comparison of achievable potentials. 

## 5.4.1 Economic Potentials Figure 5-47 compares economic GWh and MW potentials for the high avoided cost scenario against the base scenario. As shown, potentials increase by abou t 3.5 percent in the high-cost scenario. Economic potentials don’t change substantially because many of the measures studied were al ready cost effective in the base cost scenario. Figure 5-47 Economic Electric Potentials by Avoided-Cost Scenario (2020)

7,563 GWh

1,730 MW 7,823 GWh

1,794 MW

0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

Energy Savings Potential Peak Demand Potential Base Avoided Cost High Avoided Cost

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-39 

### Figure 5-48 and Figure 5-49 show how economic potentials varied by sector for the two cost scenarios. The increase in economic potential with higher avoided co sts is split fairly evenly between the residential and commercial sectors. Figure 5-48 Economic Potential Comparison (2020) Energy Savings by Sector—GWh per Year Figure 5-49 Economic Potential Comparison (2020) Demand Savings by Sector—MW

2,813 4,145

605 2,933 4,276

614

0 1,000 2,000 3,000 4,000 5,000 6,000

Residential Commercial IndustrialCumulative Annual Savings by 2020 - GWh Base Avoided Cost High Avoided Cost

818 826

86 844 862

88 0 200 400 600 800 1,000 1,200 1,400 1,600

Residential Commercial IndustrialCumulative Savings by 2020 - MW Base Avoided Cost High Avoided Cost

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-40 

### Figure 5-50 and Figure 5-51 show how residential economic potentials vary across the cost scenarios by end use. Most of the change in ener gy savings potential is in the cooling, lighting, heating, water heating, and miscellaneous end uses, while most of the change in peak demand potential is reflected in the cooling end use. Figure 5-50

Residential Economic Potential (2020) Energy Savings by End Use—GWh per Year Figure 5-51 Residential Economic Potential (2020)

Demand Savings by End Use—MW

636

165

75

733

306

46

53

213

42

76

470 689

165

84

757

306

64

53

213

42

90

470 0 200 400 600 800 Cooling
Furnace/AC Fan Heating Lighting Refrigeration Water Heating Plug Loads

Entertainment

Computers

Miscellaneous Whole Bldg (New Constr)

Cumulative Annual GWh Base Cost High Cost 490

45

0

68

46

5

6

27

5

11

115 510

45

0

71

46

7

6

27

5

12

115 0 100 200 300 400 500 600 Cooling
Furnace/AC Fan Heating Lighting Refrigeration Water Heating Plug Loads

Entertainment

Computers

Miscellaneous Whole Bldg (New Constr)

Cumulative Peak MW Base Cost High Cost

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-41 

### Figure 5-52 and Figure 5-53 show how commercial economic potentials vary across the cost scenarios by end use. Most of the increase in economic potential with the higher avoided costs is reflected in the indoor lighting and cooling end uses.

Figure 5-52 Commercial Economic Potential (2020) Energy Savings by End Use—GWh per Year Figure 5-53 Commercial Economic Potential (2020) Demand Savings by End Use—MW

1,768
185
425
108
142

216
210
78
49
34
930 1,866
196
437
115
142

216
210
78
50
34
930 0 500 1,000 1,500 2,000 Indoor Lighting Outdoor Lighting Cooling
Ventilation Refrigeration Office Equipment Data Center/Server Water Heating Vending Machines Cooking Whole Bldg (New Constr)

Cumulative Annual GWh Base Cost High Cost 278
5
263

21
15
21
28
10
5
5
175 304
5
271

22
15
21
28
10
5
5
175 0 50 100 150 200 250 300 350 Indoor Lighting Outdoor Lighting Cooling
Ventilation Refrigeration Office Equipment Data Center/Server Water Heating Vending Machines Cooking Whole Bldg (New Constr)

Cumulative Peak MW Base Cost High Cost



## 5.4.2 Achievable Potentials Increases in avoided energy costs (and rates) affect achievable program potentials in two key ways:

• 

### The higher costs increase the likelihood that customers will participate in program as the economic incentive to do so increases; this can lead to higher achievable potentials; and

• 

### The higher costs also increase the level of na turally occurring energy efficiency as more customers will install measures without program involvement because bill savings increase. Our modeling results pick up the influences of these two effects. Table 5-7 compares base and high-cost achievable potential estimates for the 2010-2020 time period by sector and program scenario. As the table shows, na turally occurring efficiency increases by about 25

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-42 

### percent with the higher energy costs as more custom ers would be willing to install energy efficiency measures and decrease their electric bill, even without Xcel Energy-provided incentives. Achievable potentials also increase for the 50-percent and 75-p ercent incentives scenarios, as it becomes easier for Xcel Energy to market and promote energy saving equi pment with higher energy co sts. Potentials decline in the 100-percent incentives scenar io because after-program economics don’t change much with higher energy costs (as all of the incremental measure costis being paid in each cost scenario) but withoutprogram economics are significantly affected by the higher energy rates. These non-program economics lead to higher naturally occurring savings that detract from program savings. Table 5-7 Comparison of Achievable Energy Potentials for Base and High Avoided Cost Scenarios Cumulative to 2020 - GWh Program Cost Scenario Percent Sector Scenario Base High Change Residential 50% Incentive 565 616 9% 75% Incentive 866 964 11% 100% Incentive 2,045 2,056 1% Naturally Occurring 311 390 25% Commercial 50% Incentive 1,054 1,153 9% 75% Incentive 1,654 1,715 4% 100% Incentive 2,473 2,439 -1% Naturally Occurring 754 922 22% Industrial 50% Incentive 184 211 15% 75% Incentive 285 286 0% 100% Incentive 374 349 -7% Naturally Occurring 79 119 50% Total 50% Incentive 1,802 1,979 10% 75% Incentive 2,806 2,965 6% 100% Incentive 4,892 4,845 -1% Naturally Occurring 1,144 1,431 25%



### Table 5-8 shows similar results as in Table 5-7 but for peak demand potentials. Peak demand results are fairly similar to the energy results. The largest ch anges across the cost scenarios are reflected in the 50- percent and 75-percent program scenarios for the resi dential and commercial sectors. Potential peak demand savings for the 100-percent scenario also s how slight increases in the high-cost scenario when compared to the base scenario.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 5-43 

### Table 5-8 Comparison of Achievable Energy Potentials for Base and High Avoided Cost Scenarios Cumulative to 2020 - MW Program Cost Scenario Percent Sector Scenario Base High Change Residential 50% Incentive 112 130 16% 75% Incentive 189 223 18% 100% Incentive 620 635 3% Naturally Occurring 36 44 25% Commercial 50% Incentive 191 215 12% 75% Incentive 310 332 7% 100% Incentive 527 534 2% Naturally Occurring 112 139 24% Industrial 50% Incentive 24 29 17% 75% Incentive 39 40 2% 100% Incentive 52 50 -4% Naturally Occurring 10 15 51% Total 50% Incentive 328 374 14% 75% Incentive 538 594 10% 100% Incentive 1,198 1,220 2% Naturally Occurring 158 198 26%

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-1 

# 6. Natural-Gas Energy-Efficiency Potential Results In this section, we present estimates of natural-gas energy-efficiency potential. First, we present technical and economic potential results for all electric measure s considered in the study. Next, we present estimates of achievable program potential under different program funding scenarios. The base results exclude impacts from behavioral-conservation programs. This additional element is discussed separately since the lasting effects of behavioral-conservati on programs are more uncertain than potentials from investing in energy-efficient technologies. 

# 6.1 Technical and Economic Potential Estimates of overall energy-efficiency technical and economic potential are discussed in section 6.1.1

. More detail on these potentials is presented in section 6.1.2 . Energy-efficiency supply curves are shown in section 6.1.3

. 

## 6.1.1 Overall Technical and Economic Potential Figure 6-1 presents our overall estimates of total techni cal and economic potential for electrical energy and peak-demand savings for the Xcel Energy Colorado service territory. Technical potential represents the sum of all savings from all of the measures deemed applicable and technically feasible. Economic potential is based on efficiency measures that are cost-eff ective, which is based on the total resource cost (TRC) test

― a benefit-cost test that compares the value of avoided energy production and power-plant construction to the costs of energy-efficiency meas ures and program activities necessary to deliver them. The values of both energy savings and peak-demand reductions are incorporated in the TRC test. Energy Savings. Technical potential is estimated at about 55 million Dth per year and economic potential at 39 million Dth per year by 2020 (about 40 and 28 percent of base 2020 usage, respectively).

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-2 

### Figure 6-1 Estimated Natural-Gas Technical and Economic Potential, 2020 Xcel Energy Colorado Service Territory

55 Million Dth

39 Million Dth

0 10 20 30 40 50 60 70

Technical EconomicCumulative Annual Dth (Millions)



## 6.1.2 Technical and Economic Potential Detail In this subsection, we explore technical and economic potential in more detail, looking at potentials by sector and by end use. 6.1.2.1 Potentials by Sector Figure 6-2 shows estimates of technical and economic energy-savings potential by sector. Figure 6-3 shows the same potentials as a percentage of 2020 base energy use. The residential sector provides the largest contribu tion to both technical and economic potential for energy savings, accounting for about 80 percent of these potentials. The commercial sector contributes about 19 percent to the technical and economic poten tials, while the industrial sector contributes only one percent. Note that transport-only customers are excl uded from the analysis, and thus potentials for many of the large nonresidential customers are not included in these results. As shown in Figure 6-3 , the residential sector also has a higher savings potential in relation to base energy use than do the commercial or industrial sectors.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-3 

### Figure 6-2 Technical and Economic Potential (2020) Energy Savings by Sector

Millions of Dth per Year Figure 6-3 Technical and Economic Potential (2020) Percentage of Base Energy Use

44.4

10.6

0.4 31.1

7.6

0.3 0 5 10 15 20 25 30 35 40 45 50

Residential Commercial IndustrialCumulative Annual Savings by 2020 - Dth (Millions) Technical Economic 45%

31%

12% 31%

22%

11%

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% 50%

Residential Commercial IndustrialPercent of Forecast Energy Use Technical Economic



### 6.1.2.2 Potentials by Building Type Figure 6-4 shows the technical and economic potentials in th e residential sector by building type. Singlefamily homes account for about three-quarters of th e potential, and low-income homes account for about 16 percent of the potential. Figure 6-5 shows the building-type breakdown of commercia l potential. Offices account for over half of the economic potential, followed by other commercial buildings.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-4 

### Figure 6-4 Residential Energy-Savings Potential by Building Type (2020)

33

5

7 23

3

5

0 1 0 2 0 3 0 4 Single Family

Multifamily

Low Income

Cumulative Annual Dth (Millions) 0 Technical Econonomic



### Figure 6-5 Commercial Energy-Savings Potential by Building Type (2020)

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Retail
Restaurant Grocery
Warehouse
School College

Health Lodging

Other

Cumulative Annual Dth (Millions) Technical Econonomic

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-5 

### Figure 6-6 shows the business-type breakdown of industri al potential. Key industries in terms of economic potential include electronics, food processing, a nd fabricated metals. Note that many of the more energy-intensive industrial customers are excluded from the analysis since they are transport-only customers. Figure 6-6 Industrial Energy-Savings Potential by Business Type (2020)

0.07
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Lumber-Furniture Paper Printing Chemicals
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Rubber-Plastics Stone-Clay-Glass
Prim Metals
Fab Metals

Ind Mach
Electronics Transp Equip
Misc Ind

Cumulative Annual Dth (Millions) Technical Econonomic



### 6.1.2.3 Potentials by End Use Figure 6-7 shows the end-use breakdown of technical a nd economic potential in the residential sector. Energy-savings potential comes predominantly fro m space heating and water heating. The wholebuilding - new construction component also consists mainly of space-h eating and water-heating measures.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-6 

### Figure 6-7 Residential Economic Energy-Savings Potential by End Use (2020)

22

14

0

1

7 16

8

0

1

7
0 5 10 15 20 25 Heating

Water Heating

Clothes Drying

Cooking

Whole Bldg (New Constr)

Cumulative Annual Dth (Millions) Technical Econonomic



### Error! Not a valid bookmark self-reference. shows the end-use breakdown of commercial potential. Similar to residential, space heating is the largest contributor to potentials, followed by water heating. Figure 6-8 Commercial Economic Energy-Savings Potential by End Use (2020)

0.6

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0 2 4 6 81 Cooking

Heating

Water Heating

Cumulative Annual Dth (Millions) 0 Technical Econonomic

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-7 

### Figure 6-9 shows the end-use breakdown of industrial potential. Savings potentials are split fairly evenly between the boiler- and process-heating end uses, with the HVAC end use contributing a smaller share to the totals. Figure 6-9 Industrial Economic Energy-Savings Potential by End Use (2020)

0.16

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0.00 0.05 0.10 0.15 0.20 Boiler

HVAC

Process Heat

Cumulative Annual Dth (Millions) Technical Econonomic



## 6.1.3 Energy-Efficiency Supply CurvesA common way to illustrate the amount of energy savings per dollar spent is to construct an energyefficiency supply curve. A supply curve typically is depicted on two axes: one captures the cost per unit of saved energy (e.g., levelized $/therm saved), and the other shows energy savings at each level of cost. Measures are sorted on a least-cost basis, and total savings are calculated incrementally with respect to measures that preceded them. The costs of the measures are levelized over the life of the savings achieved. Figure 6-10 presents the supply curves constructed for this study for natural gas. Each curve represents savings as a percentage of total energy or peak dema nd. These curves show that energy savings of almost 30 percent are available at under $1.00 per therm. Savings potentials and levelized costs for the individual measures that comprise the supply curve are provided in Appendix G.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-8 

### Figure 6-10 Natural-Gas Supply Curve*

$0.00 $1.00 $2.00 $3.00 $4.00 $5.00 $6.00 $7.00 $8.00 $9.00 $10.00

0% 5% 10% 15% 20% 25% 30% 35% 40% 45% Savings Potential as a Percent of Total Energy SalesLevelized $/Therm Saved

*Levelized cost per kWh saved is calculated using a 7.7 percent nominal discount rate. 

# 6.2 Achievable (Program) Potential In contrast to technical and economic potential estim ates, achievable potential estimates take into account market and other factors that affect the adoption of efficiency measures. We estimate measure adoption while taking into account market barriers and actual consumer- and business-implicit discount rates. This section presents results for achievable potential, first at the summary level and then by sector. More detail on achievable program potential is shown in Appendix H. Achievable potential refers to the amount of savings that would occur in response to one or more specific program interventions. Net savings associated with program poten tial are savings that are projected beyond those that would occur naturally in the absen ce of any market intervention. Because achievable potential depends on the type and degree of interventi on applied, we developed, similar to the electric analysis, potential estimates under alternative f unding scenarios: 50-percent incentives, 75-percent incentives, and 100-percent incentives. These scenarios reflect the percen t of incremental measure cost that is assumed to be paid in customer incentives. (The low-income market segment was modeled using 100-percent incentives for each scenario, but the level of program effort increased across scenarios in line with increases in other market segments.) We estimated program energy and peak-demand savings under each scenario for the 2010-2020 time period.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-9 

### Figure 6-11 shows our estimates of achievable potential savings over time. As shown, by 2020 cumulative net 9 

### energy savings are projected to be 5 m illion Dth under the 50-percent incentive scenario, 9 million Dth under the 75-percent incentive scenario, and 24 million Dth under the 100-percent incentive scenario. Figure 6-11 Achievable Energy Savings: All Sectors

0 5 10 15 20 25 30

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual Dth (Millions) Naturally Occurring 100% Incentive 75% Incentive 50% Incentive

Prog Cost to 2020: $1,247 Mil

Prog Cost to 2020: $357 Mil
Prog Cost to 2020: $148 Mil



### Figure 6-12 depicts costs and benefits under each fundi ng scenario from 2010 to 2020. The present value of program costs (including administration, marketing, and incentives) is $111 million under the 50- percent incentive scenario, $268 million under the 75 -percent incentive scenario, and $956 million under the 100-percent incentive scenario. The present value of total avoided-cost bene fits is $339 million under 50-percent incentives, $689 million under 75-percent incentives, and $1,902 million under 100-percent incentives. The present value of net avoided-cost benefits, i.e., the di fference between total avoided-cost benefits and total costs (which include participan t costs in addition to program costs), is $180 million under 50-percent incentives, $367 million under 75- percent incentives, and $888 million under 100- percent incentives.

9 

### Throughout this section, net refers to savings beyond those estimated to be naturally occurring; that is, from customer adoptions that would occur in the absence of any programs or standards.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-10 

### Figure 6-12 Benefits and Costs of Energy-Efficiency Savings—2010-2020*

$149 $64 $35 $807

$204 $76 $57

$54 $48 $1,902

$689
$339

$0 $500 $1,000 $1,500 $2,000 $2,500Present Value in $ Millions Total Avoided Cost Benefits Participant Costs Program Incentives Program Admin and Marketing

50% Incentive 100% Incentive Net Benefits: $180 Million Net Benefits: $888 Million

75% Incentive Net Benefits: $367 Million

* Present value of benefits and costs over normalized 20-year measure lives; nominal disc ount rate is 7.7 percent, inflation rate is 1.5 percent. 

### All three of the funding scenarios are cost-effective based on the TRC test, which is the test used in this study to determine program cost-effectiveness. The TRC benefit-cost ratios are 2.1 for the 50-percent incentive scenario and the 75-percent incentive scenario , and 1.9 for the 100-percent incentive scenario. This indicates that program cost-effectiveness dec lines somewhat with increasing program effort, reflecting penetration of more measures with lower co st-effectiveness levels. Key results of our efficiency scenario forecasts from 2010 to 2020 are summarized in Table 6-1

.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-11 

### Table 6-1 Summary of Achievable Potential Results—2010-2020 Program Scenario Result 50% Incentive 75% Incentive 100% Incentive Gross Energy Savings - Millions of Dth 6.1 10.6 26.0 Net Energy Savings - Millions of Dth 4.5 9.0 24.4 Program Costs - Real, $ Million Administration $33 $71 $181 Marketing $14 $15 $18 Incentives $101 $271 $1,047 Total $148 $357 $1,247 PV Net Avoided Cost Benefits $339 $689 $1,902 PV Annual Marketing and Admin Costs $35 $64 $149 PV Measure Costs $124 $258 $865 TRC Ratio 2.1 2.1 1.9

PV (present value) of benefits and costs is calcul ated over a 20-year normalized measure life for 2010- 2020 program years, nominal discount rate = 7.7 perc ent, inflation rate = 1.5 percent; Dth savings are cumulative through 2020. 

## 6.2.1 Breakdown of Achievable Potential Cumulative net achievable potential estimates by customer class for the period of 2010-2020 are presented in Figure 6-13 . This figure shows results for each funding scenario. Under the program assumptions developed for this study, achievable ener gy savings are highest for the residential sector, which is also the sector with the highest na tural-gas demand and highest economic potential.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-12 

### Figure 6-13 Net Achievable Energy Savings (2020) by Sector—Million Dth per Year

20.5

3.7

0.1 7.0

2.0 0.1 3.3 1.1 0.1 0 5 10 15 20 25

Residential Commercial IndustrialCumulative Annual Savings by 2020 - Dth (Millions) 100% Incentive 75% Incentive 50% Incentive



### 6.2.1.1 Residential Sector Figure 6-14 shows cumulative net achievable program savings by residential program scenario. By 2020, net energy savings reach 3 million Dth under the 50-percent incentive scenario, 7 million Dth under the 75-percent incentive scenario, and 20 million Dth un der the 100-percent incentive scenario. Energy savings are most sensitive to changes in incentives in the 75- to 100-percent range.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-13 

### Figure 6-14 Achievable Energy Savings: Residential Sector

0 5 10 15 20 25

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual Dth (Millions) Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 6-15 shows the end-use distribution of gas savings, cumulative to 2020. Key end uses for energy savings potential include heating, space heating, and new construction measures that mainly affect heating and space heating. The figure also shows that our models predict a large increase in savings when incentives are increased from 75 percent to 100 percent of incremental measure cost. Figure 6-15 Residential Net Energy-Savings Potential by End Use (2020)

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Water Heating

Cooking
Whole Bldg (New Constr)

Cumulative Annual Dth (Millions) 100% Incentives 75% Incentives 50% Incentives

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-14 

### Table 6-2 shows how low-income potentials compare to the overall residential potentials. The lowincome segment accounts for about 12 percent of to tal residential economic natural-gas potential and achievable potentials ranging from 12 percent to 26 percen t. Note that the low-income segment was not modeled using varying incentive levels. Rather, this segment was assumed to receive incentives equal to 100 percent of incremental measure cost for all program scenarios, and the level of program effort was adjusted to allow for the low-inco me potentials to roughly track other residential segments in terms of program achievements. Table 6-2 shows that the low-income estimates track the overall residential sector gas potentials fairly well—showing somewhat higher achievable savings in the lower incentive program scenarios. Table 6-2 Low-Income Potentials Compared to Total Residential Potentials (2020) Program Scenario Economic Potential 100% Incentive 75% Incentive 50% Incentive Residential 31,149,526 20, 493,409 6,975,190 3,299,384 Low Income 3,833,848 2, 547,731 1,147,502 847,798 % of Residential 12% 12% 16% 26%



### Table 6-3 lists the various potentials for residential m easures that passed cost-e ffectiveness screening. The list is sorted by economic potential.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-15 

### Table 6-3 Measure-Specific Residential Results (Cumulative to 2020) – Dth

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econ Ach @75% Incentives % of Net Econ Ach @50% Incentives % of Net Econ HE Water Heater (EF=0.71) 2.5 6,089,873 6,089,873 6,081,902 2,777,186 46% 858,279 14% 266,585 4% Condensing Furnace - 94 AFUE (Tier 2) 1.7 3,803,055 3,556,856 3,522,418 1,392,048 40% 551,678 16% 342,449 10% Wall 2x4 R-0 to Blow-In R-13 Insulation 2.5 3,448,552 3,442,224 3,409,368 2,960,407 87% 990,957 29% 391,667 11% High Efficiency Condensing Boiler (AFUE = 90%) 5.5 1,285,554 1,285,554 1,281,568 497,004 39% 200,588 16% 77,291 6% Crawlspace insulation 5.2 1,265,152 1,265,152 1,254,827 1,172,828 93% 567,293 45% 204,138 16% Furnace Diagnostic Testing, Repair and Maintenanc e 1.4 1,325,779 1,215,802 1,214,914 1,008,940 83% 129,692 11% 57,751 5% Windows - Double-Glazed to Energy Star 2.4 1,213,789 1,213,789 1,188,335 801,000 67% 358,668 30% 230,920 19% Basement insulation R-13 (Furnace) 1.3 1,221,995 1,093,566 1,092,160 948,938 87% 180,887 17% 89,331 8% Convection Oven 1.0 876,132 682,128 676,985 339,403 50% 103,826 15% 61,537 9% Low-Flow Showerheads 1.5 653,247 653,247 651,700 534,770 82% 121,545 19% 43,225 7% Self Install Weatherization 8.7 622,026 622,026 562,738 488,096 87% 363,730 65% 200,679 36% High efficiency gas room heater 2.4 440,790 440,790 439,593 327,636 75% 94,640 22% 34,686 8% Pipe Wrap 1.8 432,203 400,116 397,599 337,915 85% 125,812 32% 48,320 12% Duct Repair and Sealing 1.3 403,670 365,050 364,620 317,395 87% 59,978 16% 30,704 8% Ceiling R-0 to R-49 Insulation 2.4 356,382 356,382 345,731 331,291 96% 182,035 53% 79,779 23% Faucent Aerators 4.9 248,891 248,891 238,726 195,779 82% 128,382 54% 55,581 23% Boiler controls 1.2 790,567 240,132 239,461 202,697 85% 34,275 14% 5,580 2% Comprehensive Shell Air Sealing - Inf. Reduction 0.9 940,086 230,685 230,255 175,931 76% 23,307 10% 3,617 2% Boiler Diagnostic Testing, Repair and Maintenance 1.6 225,703 223,702 223,216 195,868 88% 48,157 22% 21,308 10% Basement insulation R-13 (Boiler) 1.4 203,758 198,623 198,312 174,155 88% 39,826 20% 20,168 10% Slab insulation R-0 to R-5 (4 ft) 1.4 169,273 163,214 162,766 139,517 86% 26,841 16% 8,878 5% Pipe Insulation (Boiler) 4.9 132,353 132,353 130,005 112,297 86% 57,335 44% 21,410 16% Drain Water Heat Recovery (GFX) 0.8 563,405 127,779 127,767 106,656 83% 853 1% 107 0% Basement insulation R-13 (Room Heater) 1.1 157,397 83,624 83,543 75,649 91% 22,207 27% 13,842 17% Heater Diagnostic Testing, Repair and Maintenance 2.4 53,783 53,783 53,507 47,288 88% 15,928 30% 6,921 13% Duct Insulation 4.9 10,676 10,676 10,164 8,874 87% 5,731 56% 2,783 27% New Construction Meausres Best Practice Home 1.5 4,643,174 4,310,829 4,180,440 3,096,725 74% 956,497 23% 513,558 12% ENERGY STAR Home 2.3 2,442,683 2,442,683 2,320,475 1,727,118 74% 726,243 31% 466,572 20% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive.



### 6.2.1.2 Commercial Sector Figure 6-16 shows cumulative net achievable program savings by commercial program scenario. By 2020, net natural gas savings reach 1.1 million Dth under the 50-percent incentive scenario, 2.0 million Dth under the 75-percent incentive scenario, and 3.7 million Dth under the 100-percent incentive scenario. Similar to residential, energy savings are mo st sensitive to changes in incentives in the 50- to 75-percent range.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-16 

### Figure 6-16 Achievable Energy Savings: Commercial Sector

0 1 2 3 4 5 6

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual Dth (Millions) Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 6-17 shows the end-use distribution of energy a nd peak-demand savings. Heating contributes most to the savings potential, followed by water heating. The heating end use also shows the largest difference between the 75-percent and 100-percent incentive scen arios, since a significant amount of heating potential is tied to replace-on-burnout measures. These measures would gain very high penetration levels if priced at the same cost as standard-efficiency equipment.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-17 

### Figure 6-17 Commercial Net Energy-Savings Potential by End Use (2020)

0.10

2.97

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1.46

0.48 0.01

0.79

0.33
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Heating

Water Heating

Cumulative Annual Dth (Millions) 100% Incentives 75% Incentives 50% Incentives



### Table 6-4 (existing construction) and Table 6-5 (new construction) list the various potentials for commercial measures that passed cost-effectiveness screening. Table 6-4 Measure-Specific Commercial Results (Cumulative to 2020) – Dth Existing Construction

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econ Ach @75% Incentives % of Net Econ Ach @50% Incentives % of Net Econ High Efficiency (Power Burner/ Premium) Boiler 3.2 2,145,403 1,960,609 1,915,242 590,149 31% 338,222 18% 224,269 12% Insulation (wall) 6.6 948,903 863,047 674,107 565,007 84% 392,959 58% 250,988 37% Installation of Energy Management Systems (EMS) 1.2 823,086 579,857 576,711 496,950 86% 126,456 22% 22,652 4% Water Heater Tank Blanket/Insulation 696.0 526,223 521,042 68,924 11,112 16% 10,635 15% 10,109 15% Tankless Water Heater 5.5 388,598 388,598 373,938 110,970 30% 75,476 20% 53,882 14% Clock / Programmable Thermostat 1.6 415,534 350,536 347,307 299,581 86% 100,641 29% 21,800 6% Insulation (ceiling) 9.3 353,651 349,822 245,472 201,283 82% 114,878 47% 57,588 23% Condensing Water Heater 9.3 383,060 313,545 286,177 105,947 37% 81,955 29% 61,411 21% Demand controlled ventilation (DCV) 0.6 1,400,805 258,397 257,276 221,525 86% 48,804 19% 8,205 3% High Efficiency Windows 1.7 238,159 207,844 205,570 64,898 32% 28,320 14% 16,854 8% Stack Heat Exchanger 8.5 202,598 198,090 140,175 115,431 82% 81,819 58% 51,792 37% Thermally activated heat pump/chiller 3.0 191,560 191,560 185,420 160,206 86% 92,807 50% 31,524 17% Energy Star Steamer 1.2 215,333 171,430 171,066 83,608 49% 26,268 15% 7,972 5% EMS Optimization 0.9 198,378 111,195 110,726 95,328 86% 20,593 19% 3,440 3% Demand controlled circulating systems 27.9 106,192 104,220 36,383 24,177 66% 16,713 46% 11,068 30% Retrocommissioning 2.2 40,924 34,629 33,682 29,099 86% 15,694 47% 5,084 15% Pre-Rinse Spray Valve 31.7 29,129 29,129 7,280 3,951 54% 3,401 47% 2,599 36% Hot water temperature reset 44.4 28,946 28,809 9,076 5,748 63% 4,630 51% 3,098 34% Condensing unit heaters 8.0 27,774 27,774 26,332 7,492 28% 5,740 22% 4,343 16% Hot Water Pipe Insulation 3.5 29,081 27,254 25,034 21,473 86% 12,702 51% 6,048 24% Radiant heater 10.7 26,506 26,506 24,729 6,681 27% 5,424 22% 4,304 17% Energy Star Fryer 0.6 216,306 20,204 20,184 8,386 42% 1,968 10% 505 3% Boiler Tune-Up 7.4 21,725 20,113 11,922 9,448 79% 6,195 52% 3,678 31% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-18 

### Table 6-5 Measure-Specific Commercial Results (Cumulative to 2 020) – Dth New ion Construct

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econ Ach @75% Incentives % of Net Econ Ach @50% Incentives % of Net Econ Tankless Water Heater 4.0 220,309 220,309 200,134 173,398 87% 145,850 73% 117,298 59% High Efficiency Windows 1.9 146,769 134,897 133,697 53,310 40% 25,775 19% 16,180 12% High Efficiency Furnace/Boiler 2.2 118,949 96,303 95,115 37,762 40% 19,717 21% 12,961 14% Installation of Energy Management Systems (EMS) 1.4 110,972 79,195 77,590 67,986 88% 50,268 65% 33,681 43% Demand controlled ventilation (DCV) 1.1 166,489 74,272 72,991 63,862 87% 41,778 57% 25,009 34% Thermally activated heat pump/chiller 3.1 34,728 34,728 32,480 28,291 87% 23,868 73% 19,035 59% Condensing Water Heater 8.0 48,284 33,971 32,055 11,686 36% 9,136 29% 7,075 22% Stack Heat Exchanger 8.8 26,795 26,274 20,142 16,873 84% 14,906 74% 12,870 64% Water Heater Tank Blanket/Insulation 94.2 25,007 23,757 13,416 7,457 56% 6,764 50% 6,219 46% Energy Star Steamer 1.2 29,422 23,436 23,350 10,013 43% 4,338 19% 2,170 9% EMS Optimization 1.1 29,440 17,408 17,092 14,979 88% 10,910 64% 7,161 42% Condensing unit heaters 7.8 8,701 8,701 8,323 3,133 38% 2,455 29% 1,921 23% Radiant heater 10.7 8,511 8,511 8,025 2,926 36% 2,433 30% 1,987 25% Energy Star Fryer 0.6 29,561 5,450 5,441 2,168 40% 738 14% 310 6% Hot water temperature reset 44.3 3,871 3,871 2,006 1,496 75% 1,413 70% 1,320 66% Hot Water Pipe Insulation 4.4 3,688 3,322 2,812 2,406 86% 2,120 75% 1,800 64% Insulation of Pipes 0.8 2,808 2,042 2,034 1,778 87% 948 47% 421 21% Boiler Tune-Up 4.0 2,020 1,593 1,286 1,089 85% 975 76% 848 66% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive.



### .2.1.3 Industrial Sector ievable program savings by industrial program scenario. By 2020, r 6 Figure 6-18 shows cumulative net ach net energy savings reach 0.05 million Dth under the 50-percent incentive scenario, 0.09 million Dth unde the 75-percent incentive scenario, and 0.14 million Dth under the 100-percent incentive scenario.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-19 

### Figure 6-18 Achievable Energy Savings: Industrial Sector

0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020Cumulative Annual Dth (Millions) Naturally Occurring 100% Incentive 75% Incentive 50% Incentive



### Figure 6-19 shows the end-use distribution of gas savings. Measures affecting the boiler and process-heat end uses contribute the most savings potential. Figure 6-19 Industrial Net Energy-Savings Potential by End-Use (2020)

0.06

0.02

0.06 0.05

0.01

0.03 0.03

0.00

0.02
0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 Boiler

HVAC

Process Heat

Cumulative Annual Dth (Millions) 100% Incentives 75% Incentives 50% Incentives



### Table 6-6 lists the various potentials for industrial measu res that passed cost-eff ectiveness screening.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-20 

### Table 6-6 Measure-Specific Industrial Results (Cumulative to 2020) – Dth

Measure Average TRC Ratio Technical Economic Econ net of Nat Occ Ach @100% Incentives % of Net Econ Ach @75% Incentives % of Net Econ Ach @50% Incentives % of Net Econ Improved insulation 5.0 44,800 44,800 39,142 35,375 90% 28,863 74% 19,076 49% Process Controls & Management 3.3 34,437 34,437 31,902 29,785 93% 22,698 71% 12,513 39% Heat Recovery 1.5 37,164 34,159 34,002 10,655 31% 3,133 9% 1,173 3% Steam trap maintenance 2.0 31,188 31,188 30,367 961 3% 961 3% 961 3% Efficient burners 3.5 27,755 27,755 27,556 4,729 17% 2,354 9% 1,085 4% Load control 12.7 24,363 24,363 10,987 9,660 88% 8,938 81% 7,789 71% Improve ceiling insulation 1.8 20,433 20,433 20,332 13,257 65% 3,274 16% 976 5% High efficiency (95%) condensing furnace/boiler 3.2 15,566 15,566 15,545 793 5% 309 2% 129 1% Automatic steam trap monitoring 6.0 14,359 14,359 14,160 2,159 15% 1,436 10% 812 6% Maintain boilers 69.1 12,430 12,430 1,787 1,009 56% 1,009 56% 1,009 56% Process integration 1.3 13,225 11,089 11,044 4,104 37% 1,055 10% 365 3% Improved process control 10.2 10,349 10,349 9,956 1,352 14% 1,054 11% 746 7% Efficient drying 1.6 8,781 8,781 8,779 173 2% 46 1% 17 0% Thermally activated heat pump/chiller 1.8 7,552 7,552 7,495 7,097 95% 3,092 41% 749 10% Combustion controls 2.6 7,337 7,337 7,305 2,060 28% 866 12% 294 4% Oxyfuel 1.9 6,432 6,432 6,429 178 3% 51 1% 19 0% Optimize furnace operations 2.8 6,031 6,031 5,814 4,757 82% 2,807 48% 1,315 23% Water treatment 3.5 5,142 5,142 4,795 4,106 86% 2,892 60% 1,609 34% Flue gas heat recovery/economizer 2.2 5,041 5,041 5,036 312 6% 97 2% 36 1% Upgrade burner efficiency 2.6 2,545 2,545 2,543 108 4% 38 1% 15 1% Blowdown steam heat recovery 1.5 2,453 2,453 2,452 83 3% 19 1% 6 0% Leak repair 2.5 2,431 2,431 2,308 128 6% 128 6% 128 6% Batch cullet preheating 2.8 2,161 2,161 2,156 177 8% 69 3% 28 1% Duct insulation 3.6 1,735 1,735 1,669 1,428 86% 881 53% 412 25% Thermal oxidizers 2.3 1,594 1,594 1,592 104 7% 33 2% 12 1% Improved separation processes 2.5 1,317 1,317 1,316 53 4% 18 1% 7 1% Condensate return 4.1 1,030 1,030 1,025 109 11% 57 6% 28 3% EMS optimization 2.9 841 841 799 752 94% 568 71% 286 36% Extended nip press 1.1 629 629 629 6 1% 1 0% 0 0% Preventative maintenance 5.7 487 487 357 331 93% 299 84% 237 66% Fouling control 3.5 285 285 258 240 93% 196 76% 121 47% Stack heat exchanger 1.8 280 280 279 94 34% 28 10% 10 4% Flare gas controls and recovery 3.6 174 174 173 17 10% 8 5% 4 2% Efficient furnaces 2.6 89 89 89 4 4% 1 1% 1 1% Note: TRC ratios are averages across multiple market segments. In some cases, the average TRC ratio may be below 1.0, but the measure is cost effective for some market segments, and thus, economic savings can be positive. 

# 6.3 Behavioral Conservation In addition to the base potentials forecast that are described above, we also investigated the effects of behavioral-conservation programs. The impacts of behavioral-conservation activities are much more uncertain than the impacts of the more standard en ergy-efficiency measures that are included in the base analysis, and this is why they receive separate treatment. Two types of residential behavioral-conservation meth ods are addressed in the analysis: (1) indirect feedback approaches, which utilize en ergy information reports that motiv ate customers to use less, and (2) direct feedback interventions, such use of in-home energy use monitors. Both of these approaches have

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-21 

### shown some promise in motivating customers to use less energy. However, factors such as persistence and the expected amount of energy savings have not been tested over a significant period of time or across a wide range of customers. For this analysis, we assumed that indirect feedb ack measures would save about two percent of household energy consumption at a cost of about $10 per cu stomer per year (split between the electric and gas programs). These measures could be targeted to the entire residential population. Direct methods would save about five percent per year at an equipment cost of about $140 per customer, with a measure life of four years. These direct methods could be applied to between five and ten percent of the residential population. These measure parameters are consiste nt with findings from recent pilot studies being conducted in various locales over the past several years. 10 

### Figure 6-20 shows the effects on technical and economi c potential from adding behavioral-conservation measures to the analysis. Behavioral conservation adds 2.19 million Dth of technical potential and 2.14 million Dth of economic potential to the base amounts. The behavioral-conservation potentials amount to an increase in total economic potential of about five percent and an increase to residential economic potential of about seven percent. The indirect f eedback approaches account for 90 percent of the gas behavioral-conservation potentials since they are app licable to a much larger number of customers than the direct feedback measures.

10 

### For example see Franklyn Energy, Research Study: Residential Energy Use Behavior Change Pilot , Presented to the Minnesota Department of Commerce, Office of Energy S ecurity, April 2009.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-22 

### Figure 6-20 Natural-Gas Technical and Economic Potentials with Behavioral-Conservation Activities

55.4

39.1 57.6

41.2

0 10 20 30 40 50 60 70

Technical EconomicCumulative Annual Dth (Millions) Base Analysis With Conservation



### Similar to the electric analysis, for the achievable potential assessment of the gas behavioral-conservation measures, we focused on the indirect inte rventions and developed three scenarios:

• 

### A low scenario that targets only the largest resi dential electricity users, about 0.15 million customers with average use of about 1,300 therms per year

• 

### A mid scenario that targets both large and medium residential electricity users, about 0.6 million customers with combined average elect ricity use of 950 therms per year

• 

### A high scenario that targets all residential customers, about 1.2 million customers with average electricity use of 790 therms per year In each case, program efforts were ramped up over a three-year period. Table 6-7 summarizes the results of the analysis over the 2010-2020 time period. As shown, behavioral-conservation potentials—if the assumptions outlined above hold up—could save between 0.46 and 1.90 million Dth in annual program costs averaging between $7.6 million and $51 m illion dollars, depending on how many customers are targeted for the indirect interventions. (It is also possible that Xcel Energy could reduce program costs by better targeting customers, so these estimates are probably an upper bound of program costs). All scenarios have TRC ratios that are greater than 1.0, the cutoff for cost-effectiv eness. The scenarios that target the larger users show the highest TRC ratios, because energy savings per customer are assumed to be higher, while program costs are the same as for lower-use customers.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-23 

### Table 6-7 Achievable Potentials for Natural-Gas Behavioral Conservation Scenario Result Low Large Users Only Medium Lrg-Med Users High All Customers Gross Energy Savings - Millions of Dth 0.46 1.29 1.90 Net Energy Savings - Millions of Dth 0.46 1.29 1.90 Program Costs - Real, $ Million Administration $0.1 $0.4 $0.8 Marketing $7.4 $28.6 $50.5 Incentives $0.0 $0.0 $0.0 Total $7.6 $29.0 $51.0 PV Net Avoided Costs $25.0 $70.5 $104.1 PV Annual Marketing and Admin Costs $5.6 $21.3 $37.4 PV Measure Costs $0.0 $0.0 $0.0 TRC Ratio 4.4 3.3 2.8 PV (present value) of benefits and costs is calculated over a 20-year normalized measure life for 2010-2020 program years, nominal discount rate = 7.7 percent, inflation rate = 1.5 percent; Dth savings are cumulative through 2020.



# 6.4 Alternate High Avoided Cost Scenario As indicated in section 3 above, we tested the sensitiv ity of the energy-efficiency potential analysis to increases in avoided costs by running a high avoided- cost scenario where natural gas avoided costs are about 40 percent higher than for the base scenario. In this section, we present a comparison of potentials between the base-cost scenario and the high-cost scen ario. Economic potentials are compared first, followed by a comparison of achievable potentials. 

## 6.4.1 Economic Potentials Figure 6-21 compares economic potentials for the high avoi ded cost scenario against the base scenario. As shown, potentials increase by about 6 percent in the high-cost scenario, which is higher than the change in electric potentials but still fairly modest gi ven the large assumed energy cost increases. Similar to the electric analysis, economic potentials don’t ch ange substantially because many of the measures studied were already cost effec tive in the base cost scenario.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-24 

### Figure 6-21 Economic Gas Potentials by Avoided-Cost Scenario (2020)

39 Million Dth 41 Million Dth

0 10 20 30 40 50 60 70

Base Avoided Cost High Avoided CostCumulative Annual Dth (Millions)



### Figure 6-22 shows how economic potentials vary by sector for the two cost scenarios. The increase in economic potential with higher avoided costs is reflected mainly in the residential, which is the sector that accounts for most on the gas savings potentials in both scenarios.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-25 

### Figure 6-22 Economic Potential Comparison (2020) Energy Savings by Sector—Million Dth per Year

31.1

7.6

0.3 33.0

8.0

0.3 0 5 10 15 20 25 30 35 40

Residential Commercial IndustrialCumulative Annual Savings by 2020 - Dth (Millions) 

### Base Avoided Cost High Avoided Cost



### Figure 6-23 shows how residential economic potentials vary across the cost scenarios by end use. Most of the change in savings potential is reflected in the space heating end use and in the whole-building/new construction segment, with very modest cha nges in the water heati ng and cooking end uses. For the commercial sector (see Figure 6-24 ) economic potential increases in the high-cost scenario for all end uses, but the increase is most prono unced in the space heating end use.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-26 

### Figure 6-23 Residential Economic Potential (2020) Energy Savings by End Use—Millions of Dth per Year

16.2

7.5

0.0

0.7

6.8 17.4

7.6

0.0

0.9

7.1
0 5 10 15 20 Heating

Water Heating

Clothes Drying

Cooking

Whole Bldg (New Constr)

Cumulative Annual Dth (Millions) Base Cost High Cost



### Figure 6-24 Commercial Economic Potential (2020) Energy Savings by End Use—Millions of Dth per Year

0.2

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1.9 0.2

5.8

2.0

02468 Cooking

Heating

Water Heating

Cumulative Annual Dth (Millions) Base Cost High Cost

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 6-27 

## 6.4.2 Achievable Potentials
Table 6-8 compares base and high-cost achievable potential estimates for the 2010-2020 time period by sector and program scenario. As the table shows, na turally occurring efficiency increases by about 30 percent with the higher energy costs as more custom ers would be willing to install energy efficiency measures and decrease their electric bill, even without Xcel Energy-provided incentives. Achievable potentials also increase for all the program scenarios, as more measures are cost effective with higher avoided costs, and it becomes easier for Xcel Energy to market and promote energy saving equipment with when customers see higher rates. Table 6-8 Comparison of Achievable Energy Potentials for Base and High Avoided Cost Scenarios Cumulative to 2020 – Millions of Dth

Program Cost Scenario Percent Sector Scenario Base High Change Residential 50% Incentive 3.299 4.467 35% 75% Incentive 6.975 8.934 28% 100% Incentive 20.493 21.854 7% Naturally Occurring 0.468 0.745 59% Commercial 50% Incentive 1.131 1.253 11% 75% Incentive 1.977 2.197 11% 100% Incentive 3.739 3.831 2% Naturally Occurring 1.082 1.277 18% Industrial 50% Incentive 0.052 0.060 16% 75% Incentive 0.087 0.094 8% 100% Incentive 0.136 0.138 1% Naturally Occurring 0.035 0.046 32% Total 50% Incentive 4.483 5.781 29% 75% Incentive 9.039 11.224 24% 100% Incentive 24.369 25.823 6% Naturally Occurring 1.585 2.068 30%

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 7-1 

# 7. Demand Response Potential Results To estimate demand response (DR) impacts, we reviewed impacts from the Federal Energy Regulatory Commission’s (FERC’s) 2009 National Assessment of Demand Response Potential 11 

### for the state of Colorado and customized the results to the Xcel En ergy Colorado service territory, utilizing information on Xcel Energy’s peak demand relative to the Colorado peak demand and information on current programs being run by Xcel Energy. The national study utilized a model that implemen ted a bottom-up approach to estimate DR resources. This model utilized estimated impacts for four cust omer segments (residential and small, medium, and large nonresidential segments) and five DR program cate gories (direct load control, interruptible rates, dynamic pricing with enabling technologies, dynami c pricing without enabling technologies, and other DR programs such as demand bidding). Estimates were developed for four different scenarios:

• 

### Business-as-usual (BAU): current programs and tariffs are held constant;.

• 

### Expanded BAU (EBAU): BAU program participa tion rates are increased to equal the 75th percentile of ranked participati on rates of similar programs.

• 

### Achievable Participation (AP): further assume s advanced metering infrastructure (AMI) is universally deployed, and dynamic pricing is the opt-out default tariff.

• 

### Full Participation (FP): similar to the AP scenario, except that dynamic pricing and the acceptance of enabling technology is mandatory. This scenario quantifies the maximum costeffective DR potential, absent any regulatory and market barriers.For the Xcel Energy Colorado analysis, we looked at only the business-as-usual and expanded-businessas-usual scenarios. Xcel Energy is still evaluating plans for full scale deployment of AMI. Without AMI, the dynamic pricing programs are not feasible, and dynamic pricing impacts are the key differences between the business-as-usual scenarios and the achievable and full participation scenarios. If at some future date, Xcel Energy decides to pursue AMI, then the establishment of a dynamic pricing program could lead to significant increases in demand response potential. Xcel Energy currently runs 3 major DR programs: a residential direct load control program, a nonresidential direct load control program, targeted to medium-sized customers, that is contracted out to a

11 

### A National Assessment of Demand Response Potential , Staff Report, Federal Energy Regulatory Commission, prepared by The Brattle Group, Freeman, Sullivan & Co., and Global Energy Partners, LLC, June 2009

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 7-2 

### third party implementer, and an interruptible tariff pr ogram that is targeted at large customers. The residential direct load control program is currently saving about 101 MW per y ear and could be expanded to about 211 MW per year if Xcel Energy can capture about 50 percent of the residential central air conditioning market. The nonresidential direct load control program is currently savings about 20 MW per year and is in the process of being expanded to 40 MW. Xcel Energy does not see much added potential for expanding the program further. The interruptible tariff program is currently savings about 179 MW per year, and Xcel Energy believes it can expand this program to about 227 MW per year. Table 7-1 summarizes the DR potential estimates for the Xcel Energy service territory, as compared to the National Assessment of Demand R esponse Potentials for Colorado.

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 7-3 

### Table 7-1 Comparison of National Assessment of Demand Response Potentials for Colorado with Estimates for Xcel Energy (Cumulative to 2020) Business as Usual (BAU) Expanded BAU Customer

Type DR Type Colorado* Xcel Energy % Xcel Energy Colorado* Xcel Energy % Xcel Energy Residential Pricing With Enabling Technology 0.0 0.0 - 0.0 0.0 - Pricing Without Enabling Technology 0.0 0.0 - 14.6 0.0 0% Automated or Direct Control DR 113.9 101.0 89% 144.6 211.0 146% Interruptible Tariffs 0.0 0.0 - 0.0 0.0 - Other DR 0.0 0.0 - 0.0 0.0 - Total Residential 113.9 101.0 89% 159.2 211.0 133% Small C/I Pricing With Enabling Technology 0.0 0.0 - 0.0 0.0 - Pricing Without Enabling Technology 0.5 0.5 100% 0.5 0.5 100% Automated or Direct Control DR 1.0 0.0 0% 6.6 0.0 0% Interruptible Tariffs 0.0 0.0 - 0.0 0.0 - Other DR 0.0 0.0 - 0.0 0.0 - Total Small C/I 1.5 0.5 33% 7.1 0.5 7% Medium C/I Pricing With Enabli ng Technology 0.0 0.0 - 0.0 0.0 - Pricing Without Enabling Technology 0.0 0.0 - 8.0 0.0 0% Automated or Direct Control DR 177.4 20.0 11% 177.4 40.0 23% Interruptible Tariffs 0.0 0.0 - 51.9 0.0 0% Other DR 0.0 0.0 - 0.2 0.0 0% Total Medium C/I 177.4 20.0 11% 237.5 40.0 17% Large C/I Pricing With Enabling Technology 0.0 0.0 - 0.0 0.0 - Pricing Without Enabling Technology 11.3 0.0 0% 11.3 0.0 0% Automated or Direct Control DR 0.0 0.0 - 0.0 0.0 - Interruptible Tariffs 103.6 179.0 173% 103.6 229.0 221% Other DR 20.0 0.0 0% 140.2 0.0 0% Total Large C/I 134.9 179.0 133% 255.1 229.0 90% Total Pricing With Enabling Technology 0.0 0.0 - 0.0 0.0 - Pricing Without Enabling Technology 11.8 0.5 4% 34.4 0.5 1% Automated or Direct Control DR 292.3 121.0 41% 328.6 251.0 76% Interruptible Tariffs 103.6 179.0 173% 155.5 229.0 147% Other DR 20.0 0.0 0% 140.4 0.0 0% Total 427.7 300.5 70% 658.9 480.5 73% Total Base Peak Demand 13,200.0 6,678.2 51% 13,200.0 6,678.2 51% * Colorado estimates from the FERC study run through the y ear 2019, while the Xcel Energy estimates go to 2020. 

### Table 7-1 shows that, overall, Xcel Energy could capture about 70 percent of the Colorado potential, as estimated in the FERC study, under the business-as-usual scenario (300.5 MW for Xcel Energy versus427.7 MW for the state) and about 73 percent of the Colorado potential under the expanded business-asusual scenario (480.5 MW for Xcel Energy versus 65 8.9 MW for the state). These Xcel Energy potentials are fairly aggressive, given that Xcel Energy’s retail p eak demand is expected to be about 51 percent of the state’s peak demand in 2020. The table also point s out some categorization issues associated with the National Assessment. In particular, the larg e potentials associated with the Medium C/I (commercial/industrial) Direct Control category may actually reflect savings for the Large C/I

### Xcel Energy Colorado March 12, 2010 DSM Market Potential Assessment 7-4 

### interruptible tariff category. Finally, the table show s about 0.5 MW of impacts in the Small C/I pricing category that is associated with a small Xcel Energy co mmercial pricing pilot study that is not expected to expand. Table 7-2 summarizes the estimates of demand response pot entials and associated program costs for the main Xcel Energy programs. Total savings are est imated at 300 MW for business-as-usual, increasing to 478 MW for the expanded scenario. Total program costs are estimated to be $343 million ($31 million per year) for the business-as-usual scenario and $ 535 million ($49 million pe r year) for the expanded scenario. Both scenarios are cost effective, based on the TRC test. Table 7-2 Summary of Demand Response Potentials for (2010-2020) Scenario Result Business-as-Usual (BAU) Expanded BAU Net Peak Demand Savings - MW 300 478 Program Costs - Real, $ Million Administration $14 $20 Marketing $13 $19 Third-Party $16 $32 Incentives $300 $464 Total $343 $535 PV Avoided Cost Benefits $494 $646 PV Mkt, Admin, and 3rd Party Costs $30 $49 PV Net Equipment Costs $44 $65 TRC Ratio 6.7 5.7

PV (present value) of benefits and costs is calculated using a nominal disc ount rate = 7.9 percent, inflation rate = 1.5 percent; MW savings are cumulative through 2020.